Information technology
📌JUST IN: USMANU DANFODIYO UNIVERSITY TEACHING HOSPITAL, SOKOTO HAS RELEASES NURSING SCIENCE ADMISSION FORM FOR 2024/2025 ACADEMIC SESSION
IF YOU HAVE INTEREST, CONTACT ME.
07035090316
*#SEVEHO*
posted by HUNTEMEN STANDARD ACADEMY @ September 06, 2024
0 Comments
A.
CERTIFICATE IN JUNIOR COMMUNITY HEALTH (JCHEW)
B.
ENVIRONMENTAL HEALTH ASSISTANTS: (EHA)
C.
ENVIRONMENTAL HEALTH TECHNICIAN: (EHT)
D.
HIGHER DIPLOMA
E.
HIGHER NATIONAL DIPLOMA (HND) IN ENVIRONMENTAL HEALTH TECHNOLOGY.
F.
HIM DIRECT ENTRY
G.
MEDICAL LABORATORY TECHNICIAN (CONVERSION)
H.
SCHOOL OF COMMUNITY HEALTH
I.
SCHOOL OF COMPLEMENTARY HEALTH SCIENCE
J.
SCHOOL OF ENVIRONMENTAL HEALTH (NATIONAL DIPLOMA)
K.
SCHOOL OF HEALTH INFORMATION MANAGEMENT
L.
SCHOOL OF MEDICAL LABORATORY SCIENCE
M.
SCHOOL OF PHARMACY
N.
TECHNICIAN CERTIFICATE IN MEDICAL LABORATORY SCIENCES IN PHLEBOTOMY
How to Apply for
LASCOHET Admission Form
In
line with the modern trends of simplicity and convenience, the College has
established an efficient online application process. Below is the procedure for
the 2023/2024 online application for admission:
Step
1: Visit
the LASCOHET online portal via www.lascohet.com/portal/online.
Step
2: Once
on the portal, you’ll need to select your desired method to obtain the
application form. Choose the appropriate option and then click the ‘continue’
button.
Step
3: Next,
you will need to provide your biodata information. After filling in the
required fields, proceed by clicking on the ‘Continue and pay options’.
Step
4: Be
sure to save your details, and then click on the ‘Pay Now’ button to make the
payment for the application form.
Step
5: After
initiating the payment process, click on the ‘Make Payment’ button.
Step
6: Choose
your preferred channel of payment. Options available include MasterCard, VISA,
VERVE or Bank Transfer.
Step
7: Once
the payment is successful, you will be able to print a receipt. Subsequently,
you can go ahead and fill out the application form online.
For
any inquiries or support during the application process, the college has set up
a dedicated support line. You can call 08038394229
or WhatsApp 07035090316 or
alternatively, send an email to huntemenmathew@gmail.com
This
is a great opportunity for anyone seeking to advance their career in the
healthcare field. Don’t miss out on the chance to study in one of the leading
health technology institutions in the state. Apply now and step into a future
filled with possibilities in the healthcare sector.
posted by HUNTEMEN STANDARD ACADEMY @ May 28, 2023
0 Comments
JAMB Reschedules UTME for Candidates
The Joint Admissions and Matriculation Board (JAMB) has rescheduled the ongoing Unified Tertiary Matriculation Examination for candidates who could not sit for the exam on Tuesday because of technical challenges.
The Board made the announcement in a statement on Tuesday in Abuja by the Head, Public Affairs and Protocol, JAMB, Dr Fabian Benjamin.
The statement reads: “Following the announcement, candidates, who for technical reasons could not take the examination, are to print a new examination notification early tomorrow morning, Wednesday, 26th April, 2023, to know their new scheduled sessions.
“It is to be noted that about 100 centres out of the 708 centres participating in the 2023 UTME exercise across the country, experienced technical challenges that prevented their allotted candidates from successfully taking their examination.”
According to the statement, the Board reiterated its determination to deploy world-class assessments in line with global best practices to deliver quality assessments and regretted any inconveniences experienced by candidates and their parents.
The statement further restated that the series of challenges encountered was on account of some novel features deployed by the Board to safeguard the sanctity of the examination by checkmating all incidences of examination misconduct being perpetrated and perpetuated by vested interests.
The Board, therefore, reiterated the commitment of its technical team working round the clock to ensure that tomorrow’s (Wednesday) exercise was devoid of any hitches.
Meanwhile, the Board assures Nigerians that no candidate would be denied the right of taking his/her examination because in case of any challenges experienced, such a candidate would be rescheduled to take the examination in the next available date and space. You can read more here.
posted by HUNTEMEN STANDARD ACADEMY @ April 26, 2023
0 Comments
Chemistry
huntemen.blogspot.com
1..An isotope has an atomic number of 15 and mass number of 31..The proton it contain is
A..16
B..15
C..31
D..46
2. Calculate the volume in cm³ of oxygen evolved at s.t.p. when a current of 5A is passed through acidified water for 1..(Molar volume of gas at STP =22.4DM³
A..0.056
B..0.224
C..224.000
D..56.0000
3. The sulphide used in coating electric fluorescent tubes is
A)iron(II) sulphide
B)sphalerite
C)zinc sulphide
D) sulphide mineral
4. Hydrogenation of Benzene to Cyclohexane
A. Cracking
B. Polymerisation
C. Reforming
D. Aromatization
5. If the half life of a particle is 4.5 how long will it decay 3/4 of its mass.
6. BaS04 is
A)soluble salt
B)insoluble salt
C)neutral salt
D)basic sat
7. The gas that can best be collected by downward displacement of air is
A. Ammonia
B. Carbon (iV) oxide
C. Chlorine
D. Sulphur (iV) oxide
8. The pollutant that contributes to the depletion of the ozone layer is
a)CFCs
B)CFs
C)CFS
D)CFC
9. What changes sodium pellets to liquid
a. Oxygen
b. Water vapour
c. Carbon(Iv) oxide
d. Nitrogen
10. The compound used as "antifreeze" in car radiators in cold regions of the world is
A. Ethanol
B. Ethylene glycol
C. Ethanal
D. Propane-1, 2-diol
⚡Chemistry
11. The PH of 0.001dm³ of HCl is ???
12. What are the laws that form the general gas equation
A. Boyle and Charles
B. Boyle's, Charles and Graham
C. Boyle's only
D. Charles and Graham
13. Chlorine, bromine, and iodine resembles each other in that all
A. Dissolves in alkalis
B. Displace each other from solution of their salts
C. React violently with hydrogen with heating
14. What changes sodium pellets to liquid
a. Oxygen
b. Water vapour
c. Carbon(Iv) oxide
d. Nitrogen
15. The method suitable for separating suspended particles in liquid is....?
A. Decantation
B. Distillation
C. Centrifugation
16. A hydrocarbon X has molar mass 26 carban Atoms 96% what is it's molecular formula
A. C2H2
B. C2H6
C. CH4
D. C3H8
17. Silica gel when exposed to air turns liquid what kind of substance is it
A) delinquency
B)hygroscopic
C) efflorescence
18. In an equilibrium reaction, which of the following conditions indicate the maximum yield of the product will be obtained
A. Equilibrium constant is very large
B. ∆H – T∆S
C. ∆H > T∆S
D. Equilibrium constant is less than zero
19. Under high pressure,real gases do not obey gas laws because their molecules?
a.Have become more energetic
b.Have become less energetic
c.Have become smaller in size
d.Decompose into atoms
20. Which of the following has the highest-octane number?
A. Straight chain aliphatic compound
B. Branched chain aliphatic compound
C. Aromatic compound
D. Cyclic aliphatic compounds
JAMB CHEMISTRY QUESTIONS AND ANSWERS EXTRACTED FROM TODAY'S EXAM
1. 200 cm³;of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158 cm³. Estimate the percentage of oxygen in the air. (A) 31%
(B) 27%
(C) 21% ✅
(D) 19%
2. 30cm³ of oxygen at 10 atmosphere pressures is placed in a 20dm³ container. Calculate the new pressure if temperature is kept constant.
(A) 6.7 atm
(B) 15.0 atm ✅
(C) 60.0 atm
(D) 66.0 atm
3. Bond dissociation energy of 500 KJ mol-¹ may be assigned to
(A) ionic bonding ✅
(B) covalent bonding
(C) hydrogen bonding
D) metallic bonding
(E) van-der-waals bonding.
4. A mixture of iron and sulphur can be separated by dissolving the mixture in __
(A) steam
(B) dilute hydrochloric acid
(C) dilute sodium hydroxide
(D) benzene ✅
5. A mixture of sand, ammonium chloride and sodium chloride is best separated by __
(A) sublimation followed by addition of water and filtration ✅
(B) sublimation followed by addition of water and evaporation (C) addition of water followed by filtration and sublimation
(D) addition of water followed by crystallization and sublimation
6. A pure solid usually melts __
(A) over a wide range of temperature
(B) over a narrow range of temperature ✅
(C) at a lower temperature than the impure one
(D) at the same temperature as the impure one
7. A small quantity of solid ammonium chloride was heated gently in a test tube; the solid gradually disappeared to produce a mixture of two gases. Later a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone __
(A) distillation
(B) sublimation ✅
(C) precipitation
(D) evaporation
8. CH4 has this geometry
(A) trigonal
(B) planar
(C) tetrahedral ✅
(D) octahedral
(E) linear.
9. Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.
The relative abundance of the isotope of mass number 37 is _ (A)20
(B) 25 ✅
(C) 50
(D) 75
10. Elements P, Q, R, S, have 6, 11, 15 and 17 electrons respectively, therefore
(A) P will form an electrovalent bond with R
(B) Q will form a covalent bond with S
(C)R will form an electrovalent bond with S
(D) Q will form an electrovalent bond with S ✅
11. In the oil drop experiment, Millikan determined the
(A) charge to mass ratio of the electron
(B) mass of the electron
(C) charge of the electron ✅
(D) mass of the proton
12. One of these atomic shells is the most stable
(A) M
(B) N
(C) K ✅
(D) L
(E) O
13. Sieving is a technique used to separate mixtures containing 20% oxygen by volume. Which of the reactants was in excess?
(A) Carbon (II) oxide ✅
(B) Oxygen
(C) Carbon (IV) oxide
(D) Nitrogen A
14. The abnormally high boiling point of water is primarily due to (A) ionic bonding
(B) covalent bonding
(C) dative bonding
(D) coordinate covalent bonding
(E) hydrogen bonding.✅
15. The energy required to remove an electron from the isolated gaseous atom is known as
(A) electron affinity
(B) bond energy
(C) lonisation energy ✅
(D) electronegativity
(E) electrovalency.
16. The group that oxygen belongs to is collectively called
(A) allotropes
(B) halogens
(C) chalcogens ✅
(D) alkenes
(E) ozonides.
17. The ideal gas equation is _ ( A) PV=nRT ✅
(B) PR =nVT
(C) PV =gRT
(D) V=kT
(E) PV = KV
18. The number of atoms in one mole of a substance is equal to
(A) the atomic number
(B) the Avogadro’s number ✅
(C) number of neutrons
(D) number of electrons
(E) gas constant
19. The number of electrons in the outermost shell of the atom represents its
(A) period
(B) number of shells
(C) group✅
(D) atomic number
(E) electronegativity.
20. The number of protons or electrons of an atom represents its (A) electronegativity
(B) period
(C) number of shells
(D) group
(E) atomic number ✅
21. The partial pressure of oxygen in a sample of air is 500 mmHg. If the total Pr pressure is 780 mmHg, what is the mole fraction of the oxygen?
(A) 0.64 ✅
(B) 5.73
(C) 1.56
(D) 0.70
(E) 0.54
22. The periodic classification of the elements is an arrangement of the elements in order of their
(A) atomic weights
(B) isotopic weights
(C) molecular weights
(D) atomic numbers ✅
23. The process of changing one element into another is called
(A) radioisotope
(B) radioactivity
(C) dating
(D) transmutation ✅
(E) nuclear reaction.
24. The shapes of CO2, H2O and CH4 respectively are
(A) bent, linear and tetrahedral
(B) bent, tetrahedral and linear
(C) tetrahedral, linear and bent
(D) linear, bent and tetrahedral ✅
25. This compound exhibits ionic bonding
(A) H20
(B) H2
(C) KCl ✅
(D) NH3
(E) HF.
26. This type of bonding involves overlapping of orbitals during which electrons are shared
(A) hydrogen bonding
(B) covalent bonding ✅
(C) ionic bonding
(D) metallic bonding
(E) van-der-waals bonding.
27. Which one of the following changes is physical?
(A) Adding iron filings to aerated water
(B) Adding sodium metal to water
(C) Cooling a solution of iron(II) sulphate to obtain the hydrated salt
(D) Cooling water to obtain ice ✅
28. Fruit juices and fizzy drinks such as lemonade are often sold in aluminium can. the most important reason for this is
(A) aluminium can be recycled
(B) aluminium has a very low density
(C) aluminium is the most abundant metal in the earth crust
(D) aluminium is resistant to corrosion by acid.✅
29. Ammonia is very soluble in water because it is a /an molecule (A) non-polar
(B) polar ✅
(C) reactive
(D) basic
(E) acidic
30. Citrus fruits such as lemon and grape taste sour because they contain
(A) ascorbic acid and citric acid ✅
(B) citric acid and ascetic acid
(C) citric acid and dilute HCl
(D) citric acid and salicyclic acid
(E) Sulphuric acid
31. Soap lather is an example of a colloid in which a
(A) liquid is dispersed in gas
(B) solid is dispersed in liquid
(C) gas is dispersed in liquid ✅
(D) liquid is dispersed in liquid
32. The air around a petroleum refinery is most likely to contain.
(A) CO2, SO3and N2O
(B) CO2, CO and N2O
(C) SO2, CO and NO2✅
(D) PH3, H2O and CO2
33. The difference between colloids and suspensions is brought out clearly by the fact that while colloids
(A) do not scatter light, suspensions do
(B) can be separated by filtration, suspensions cannot be so separated
(C) can be separated by a membrane, suspensions cannot
(D) do not settle out on standing, suspensions do ✅
34. The following substances are non-electrolytes except
(A) chloroform
(B) sugar cane
(C) acetic acid
(D) NaCl
(E) C and D✅
35. The hydrolysis of NH4Cl salt will give
(A) acidic solution ✅
(B) neutral solution
(C) basic solution
(D) hot solution
(E) all of the above
36. The pollutants that are likely to be present in an industrial environment are
(A) H2S, SO2and oxides of nitrogen ✅
(B)NH3, HCl and CO
(C) CO2, NH3, and H2S
(D) dust, NO and Cl2
37. What is the basicity of tetraoxosulphate (VI) acid?
(A) 2 ✅
(B) 1
(C) 3
(D) 4
(E) 0
38. Dalton's atomic theory successfully explains
i. Law of conservation of mass
ii. Law of constant composition
iii. Law of radioactivity
iv. Law of multiple proportion
(A) i and ii
(B) i only
(C) i, ii and iv ✅
(D) i, ii and iii
39. Which ion is most polarizing
(A) Al³+ ✅
(B) Ba²+
(C) Mg²+
(D) Na+
40. Which of the following is an example of a double salt
(A) NH4Cl
(B) alum ✅
(C) NaCO3
(D) AlCl3
(E) NaCl
41. 0.16g of methane when burnt increases the temperature of 100g of water by 400°C, what is the heat of combustion of methane if the heat capacity of water is 4.2 Jg-¹°C-¹? (CH4=16).
(A) 1,160kJmol-¹
(B) 1,180kJmol-¹
(C) 1,560kJmol-¹
(D) 1,600kJmol-¹
(E) 1,680kJmol-¹ ✅
42. A charged car battery has _ energy that can be converted into another energy called _ energy (A) Chemical, electrical ✅
(B) mechanical, chemical
(C) heat, mechanical
(D) light, electrical
(E) light, heat
43. Copper oxide is heated with charcoal to produce carbon monoxide and copper. The reaction is an example of
(A) both oxidation and reduction ✅
(B) neither oxidation and reduction
(C) oxidation only
(D) reduction only
(E) neutralization
44. For each oxygen atom in hydrogen peroxide which acts as an oxidant, there is an oxygen atom which acts as a /an
(A) Oxidant
(B) reductant ✅
(C) oxidizing agent
(D) catalyst
(E) inhibitor
45. Given the change of phase: CO2(g) changes to CO2(s), the entropy of the system
(A) decreases ✅
(B) increases
(C) remains the same
(D) increases and the decreases
46. In which of the following is the entropy change positive?
(A) Reaction between an acid and a base.
(B) Addition of concentrated acid to water.
(C) Dissolution of sodium metal in water.✅
(D) Thermal dissociation of ammonium chloride.
47. One of these elements is the best reducing agent.
(A) Pb
(B) Rb ✅
(C) Al
(D) In
(E) N
48. The name of the gas driven off at the negative electrode during the electrolysis of brine is _
(A) hydrogen
(B) chlorine ✅
(C) oxygen
(D) sodium
(E) hydrogen chloride
49. The oxidation state of P in H2P207²-is _
(A) -3
(B) +3
(C) +1
(D) +5 ✅
(E) -2
50. The oxidation state of S in Ca(HS03)2 is __
(A) +2
(B) -2
(C) +4 ✅
(D) -4
(E) +6.
51. The oxidizing agent in the reaction, 3Br2 + 6OH- = BrO³- + 5Br- + 3H2O is __
(A) Br2✅
(B) OH-
(C) BrO3-
(D) e-
(E) H2O.
52. When heat is absorbed during a chemical reaction, the reaction is said to be _
(A) thermodynamic
(B) exothermal
(C) isothermal
(D) endothermic ✅
(E) thermostatic
53. Given the reaction at equilibrium:
2CO(g) + O2(g) --> 2CO2(g)
When the reaction is subjected to stress, a change will occur in the concentration of
(A) reactants, only
(B) products, only
(C) both reactants and products ✅
(D) neither reactants nor products
54. Given the reaction at equilibrium:
N2(g) + O2(g) ---> 2NO(g)
as the concentration of N2(g) increases, the concentration of O2(g) will
(A) decrease✅
(B) increase
(C) remains the same
(D) vanishes
(E) pours away
55. If a reaction is exothermic and there is a great disorder, it means that
(A) The reaction is in a state of equilibrium
(B) There will be a large increase in free energy ✅
(C) There will be a large decrease in free energy
(D) The reaction is static.
56. In the chemical reaction of
A + B = C +D,
more of D is formed
(A) if the concentration of A is reduced
(B) if the concentration of B is reduced
(C) if the concentration of C is reduced
(D) if the concentration of C is increased
(E) if it is continuously removed from the reaction mixture ✅
57. In what way is equilibrium constant for the forward reaction related to that of the reverse reaction?
(A) The addition of the two is expected to be one.
(B) The product of two is expected to be one.
(C) The two equilibrium constants are identical. ✅
(D) The product of the two is always greater than one.
58. In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased?
(A) C(s) + O2(g) --> CO2(g)
(B) CaCO3(s) ---> CaO(s) + CO2(g)✅ (C) 2Mg(s) + O2(g) ---> 2MgO(s)
(D) 2H2(g) + O2(g) ---> 2H2O(g)
59. The furring of kettles is caused by the presence in water of __
(A) calcium trioxocarbonate (IV)
(B) calcium tetraoxosulphate (VI)
(C) calcium hydroxide
(D) calcium hydrogentrioxocarbonate (IV) ✅
60. Which is a property of a reaction that has reached equilibrium?
(A) The amount of products is greater than the amount of reactants.
(B) The amount of products is equal to the amount of reactants.
(C) The rate of the forward reaction is greater than the rate of the reverse reaction.
(D) The rate of the forward reaction is equal to the rate of the reverse reaction.✅
61. Which of the following combination of conditions many increase the rate of a chemical reaction.
(A) Decrease in temperature, increase in concentration of the reactant
(B) Increase in temperature, addition of a catalyst, decrease in the surface area of the reactant
(C) Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactant ✅
(D) Decrease in temperature, concentration and surface area of the reactants
(E) Addition of catalyst and in the absence of light.
62. “Quicklime” has the formula __
(A) Ca(OH)2
(B) CaO ✅
(C) CaCO3
(D) CaSO4.2H2O
(E) CaCl2
63. A Transition metal is different from a non-transition metal because
(A) it has an octet configuration
(B) it is very stable
(C) it is coloured
(D) it has incomplete outer shell d-electrons ✅
(E) it has no electron in the d-orbital.
64. Chlorine is produced commercially by
(A) electrolysis of dilute HCl
(B) electrolysis of brine ✅
(C) neutralization of HCl
(D) heating potassium trioxochlorate (V)
(E) action of dilute mineral acids on bleaching powder.
65. Chlorine, bromine and iodine resemble one another since they __ (A)dissolve in alkalis ✅
(B) react violently with H2
without heating
(C)displace each other from solutions of their salts
(D) are gases
(E) are liquids.
66. Liquid oxygen may be produced by condensation of air using this coolant
(A) liquid phosphorus
(B) liquid gas
(C) liquid paraffin
(D) liquid nitrogen ✅
(E) butane.
67. One of these is another form of oxygen
(A) hydroxide
(B) ozone ✅
(C) peroxide
(D) sulphur oxide
(E) water.
68. One of these metals is not an alkali metal
(A) K
(B) Cs
(C) Sr ✅
(D) Rb
(E) Fr
69. One of these reactions represents the laboratory preparation of hydrogen.
(A) C(s) + H2O(l) ---> CO(g) + H2(g)
(B) 2 Na(s) + 2H20(1) ---> 2 NaOH(aq) + H2(g)
(C) Cu(s) + H2O(l) ---> CuO(s) + H2(g)
(D) 2Al(s) + 3H2O(l) ---> Al2O3(s) + 3H2(g)
(E) Zn(s) + 2HCl(aq) ---> ZnCl2(aq) + H2(g)✅
70. The formation of ozone by reaction of O2 with atomic oxygen in UV light occurs in
(A) upper atmosphere ✅
(B) inner atmosphere
(C) stratosphere
(D) hemisphere
(E) none of these.
71. The halogen which is chiefly produced commercially from sea water is _
( A) Fluorine
(B) chlorine ✅
(C) Bromine
(D) iodine
(E) Astatine.
72. The most stable allotropic form of sulphur at normal conditions is _
(A) monoclinic sulphur
(B) rhombic sulphur ✅
(C) amorphous sulphur
(D) plastic sulphur
(E) ordinary sulphur
73. The products obtained when the following chemical reaction is completed and balanced are…HNO3+ Ca(OH)2 ---> __
(A) CaNO3+ H2O
(B) Ca(NO3)2+ 2H2O ✅
(C) CaO + 2 NO2+ 3H2O
(D) Ca + 2 NO3+ 2 H2O
74. What is the role of iron and Aluminium oxide in ammonia production?
(A) dehydrating agent
(B) catalytic agent✅
(C) oxidizing agent
(D) bonding agent
(E) preservative agent
75. When carbon IV oxide is bubbled through lime water, the solution becomes milky due formation of
(A) Ca(HCO3)2
(B) CaCO3✅
(C) Ca(N03)2
(D)CaCl2
(E) CaSO4
76. Which of the following gases dissolves in water vapour to produce acid rain during rainfall?
(A) Oxygen
(B) Carbon (II) oxide
(C) Nitrogen
(D) Sulphur (IV) oxide ✅
77. Which of the following is not allotrope of carbon?
(A) diamond
(B) graphite
(C) graphene
(D) all of the above
(E) none of the above ✅
78. Which oxide is amphiprotic (amphoteric)?
(A) MgO
(B) NaO
(C) CaO
(D) ZnO ✅
(E) BeO
79. Why will it always be more difficult to extract potassium ions from sea water than to extract magnesium ions? This is because
(A) most potassium compounds are less soluble in water
(B) most potassium compounds are quite soluble in water ✅
(C) presence of other alkali metal ions has great influence on it
(D) magnesium ion is an alkaline earth metal ion.
(E) None of the above.
80. _____ can be used to test for reducing sugars:
(A) Iodine solution
(B) bromine water
(C) Fehling’s solution ✅
(D) de-ionized water
81. 2CH3COOH + Zn ---> ?
The product of this reaction is:
(A) (CH3COO)2Zn + Zn
(B) CH3COOCH3+ Zn
(C) (CH3COO)2Zn + H2 ✅
(D) CH3COOH + CH4
82. A ketone reacts with hydroxylamine to give
(A) a hydrazone
(B) an alkanonitrile
(C) a nitroso compound
(D) an oxime ✅
83. Alkanoic acids are weak acids and ionises in solution to give:
(A) R⁺ + COOH
(B) RCOO⁻ + H⁺✅
(C) RCOO⁺ + H⁻
(D) RCO⁺ + OH⁻
84. An excess of ethanol heated with concentrated H2SO4 at a temperature of 180°C is dehydrated to give mostly:
(A) ethane
(B) ethene ✅
(C) ethanol
(D) ethoxyethane
85. Butene can be distinguished from benzene by reaction with:
(A) Hydrochloric acid
(B) Bromine water ✅
(C) Potassium sulphate
(D) Sodium hydroxide
86. Detergent is more efficient than soap in cleansing clothes and dishes because of the following reasons except that:
(A) the corresponding Ca and Mg compound formed is soluble in H2O
(B) detergents are not affected by hardness of water
(C) it cleans better than soap
(D) it is less expensive ✅
87. In the manufacture of soap industrially, brine is used to.____.the acid salt.
(A) oxidise
(B) reduce
(C) bleach
(D) precipitate ✅
88. Methane gas can be made from carbon (II) oxide gas according to the equation
2CO(g) + 2H2(g) ---> CH4(g) + CO2(g).
Calculate the mass of CO required to produce 8.75 x 10²⁵ molecules of CH4?
{At masses: C=12.011, H= 1.008, O = 15.999, Avogadro’s no: 6.022 x 10²³molecules /mole.}
(A) 8140g ✅
(B) 4070g
(C) 1600g
(D) 32.00g
(E) 20.35g
89. Potassium ethanoate is formed when:
(A) Methanoic acid reacts with KOH
(B) Ethanoic acid reacts with KOH✅
(C) Methanol reacts with KCO3
(D) Ethanol reacts with CH3COOH
90. Saponification is defined as:
(A) Acidic hydrolysis of fat or oil
(B) Alkaline hydrolysis of fat or oil✅
(C) Condensation of two monomer units
(D) Mixture of glacial ethanoic acid and excess of simple alkanol
91. Soaps and detergents have the same basic characteristics except that the carboxyl group of the fatty acid in detergent is replaced by:
(A) alcohol
(B) sulphate or a sulphonate group✅
(C) ester
(D) acids
92. The relatively high boiling point of alkanols is due to:
(A) aliphatic character
(B) ionic bonding
(C) hydrogen bonding ✅
(D) covalent bonding
93. Two important sources of detergent are :
(A) fat/oils and hydrocarbons✅
(B) coal and cement
(C) pulp and wood
(D) water and gas
94. When 20cm³ of a gaseous hydrocarbon is were completely burnt in excess oxygen. 60cm³ of carbon dioxide and 40cm³ of water vapour were formed. All volumes being measured at stp. What is the formula of the hydrocarbon?
(A) C2H6
(B) C3H4 ✅
(C) C3H6
(D) C3H8
95. When ethanal vapour is passed over manganese (II) ethanoate (manganese acetate) catalyst in the presence of air, the product is:
(A) ethanoate
(B) ethanol
(C) methanol
(D) ethanoic acid ✅
96. When KOH is used instead of NaOH in the production of soap, it has the following advantages except it gives:
(A) softer soap
(B) harder soap ✅
(C) soap with lower melting point
(D) more soluble soap
97. When palm wine is left exposed to air for a few days, it goes sour. The bacteria in the air oxidises.___ in palm wine to ____
(A) ethanol, ethanoic acid ✅
(B) ethanoic acid, ethanol
(C) ester, ethanoic acid
(D) ether, ethanol
98. Which of the following is not true about benzoic acid?
(A) It is aromatic in nature
(B) It can be manufactured from methylbenzene
(C) It has molecular formula C6H6COOH ✅
(D) It sublimes readily
99. Which of the following reactions is correct?
(A) C6H5COOH + CaO ---> C6H5Ca + HCO3
(B) C6H5COOH + CaO ---> C6H6+ CaCO3✅
(C) C6H5COOH + PCl5 ---> C6H5Cl + H2PO4
(D) C6H5COOH + C2H5OH ---> C6H6 + C3H8COOH
100. Which of these is not a property of ethanedioic acid?
(A) It is a stronger acid than ethanoic acid but weaker than inorganic acids
(B) It is a reducing agent
(C) It is an oxidising agent✅
(D) It is soluble in cold water
101. The early attempt to classify element as metals and non metals was made by
(A) Mendeleev
(B) Lothar Meyer
(C) Lavoisier ✅
(D) Henry Moseley
102. In absence of a catalyst, ammonia burns in an excess of oxygen to produce steam and nitrogen, what is volume of oxygen remaining when 60cm³ of ammonia burns in 100cm³ of oxygen. All volume being measured at stp?
(A) 35cm³
(B) 40cm³
(C) 45cm³
(D) 55cm³ ✅
103. Which solid exhibit more than one kind of chemical bonding
(A) brass
(B) copper
(C) diamond
(D) ice ✅
104. What kind of orbital must an electron with principal quantum number 2 occupy
(A) a spherical shaped orbital
(B) either an s or a p orbital ✅
(C) the orbital closest to the nucleus
(D) a dumb bell shaped orbital
105. Naturally occurring silicon is a mixture of three isotopes Si-28, Si-29, Si-30. The relative atomic mass of silicon is 28.109. what could be the relative abundance of each of the three isotopes respectively
(A) 91.1%, 7.1% and 1.0%
(B) 92.2%, 4.7% and 3.1% ✅
(C) 95.0%, 3.2% and 1.8%
(D) 96.3%, 0.3% and 3.4%
106. An ion has a charge of +3.
The nucleus of the ion has a mass of 120. The number of neutrons in the nucleus is 1.50 times that of the number of protons. How many electrons are in the ion?
A. 55
B. 48
C. 45 ✅
D. 42.6
107. The molarity of 5% by weight of aqueous solution of tetraoxosulphate (VI) acid [molecular weight = 98] is
A. 0.537moldm-³ ✅
B. 0.208moldm-³
C. 0.551moldm-³
D. 0.333moldm-³
108. Uranium-235 explodes when bombarded with a slow-moving neutron according to the equation below:
²³⁵U + ¹n ⟶ ⁹⁴Kr + ˣBa + 3¹n
The mass number of Ba, x is
A. 126
B. 116
C. 139 ✅
D. 146
109. What is the pH of 500cm³ of 0.02 mol dm−³ tetraoxosulphate (VI) acid?
A. 1.456
B. 1.333
C. 1.455 ✅ and without calculator = 1.4
D. 1.699
110. What volume of 0.750moldm-³ Na2CO3 solution could be diluted to 250cm³ to reduce the concentration of 0.025moldm-³?
A. 16.8cm³
B. 14.2 cm³
C. 10.4 cm³
D. 8.3 cm³ ✅
111. If 7.0 g of ethane at s.t.p occupy 5.6 dm³, what volume will 7.5 g of ethane at the same condition occupy?
(C = 12; H =1;
GMV at s.t.p = 22.4 dm³)
A. 6.0 dm³ ✅
B. 5.6 dm³
C. 5.2 dm³
D. 9.4 dm³
112. The number of neutrons in the deuterium atom is/are
A. 0
B. 1 ✅
C. 2
D. 3
113. 40 grams of sodium nitrate were added to 50cm³ of water to give a saturated solution at 298k. if the solubility of the salt is 10.50 mol dm³ at the same temperature, what percentage of the salt is left undissolved? [Na = 23, N = 14 and O = 16]
A. 11.56% ✅
B. 2.55%
C. 5.88%
D. 12.45%
114. What quantity of current is required to deposit 2.4g of copper in a period of 750 seconds during an electrolytic deposition process?
[Cu 64, IF = 96500C mol-1]
A. 9.65A ✅
B. 10.81A
C. 12.33A
D. 15.54A
115. An atom has a core and outside the core an electron occupies an orbital for which the principal quantum number = 4, l = 0, ml = 0 and ms = +½ or –½.
The atom is likely to be
A. boron
B. sodium
C. potassium ✅
D. fluorine
116. How many isomers can be formed from organic compounds with molecular formular C5H12O?
A. 4
B. 10
C. 8✅
D. 6
E.16
117. A given volume of methane diffuses in 20s. How long will it take the same volume of sulphur (IV) oxide to diffuse under the same conditions?
[C = 12, H = 1, S = 32, O = 16].
A. 5s
B. 20s
C. 40s ✅
D. 60s
118. What is the IUPAC name of the hydrocarbon: CH3CHC(CH3)CH2CH2(Cl)...
A. 1-chloro-3-methyl pent-3-ene
B. 5-chloro-3-methyl pentane
C. 1-methyl-1-chloroethyl propene
D. 5-chloro-3-methyl pent-3-ene✅
HUNTEMEN STANDARD ACADEMY
posted by HUNTEMEN STANDARD ACADEMY @ April 25, 2023
4 Comments
posted by HUNTEMEN STANDARD ACADEMY @ April 21, 2023
0 Comments
What is Isomerism?
Isomerism is the phenomenon in which
more than one compounds have the same chemical formula but different chemical
structures.
Chemical compounds that have identical
chemical formulae but differ in properties and the arrangement of atoms in the
molecule are called isomers.
Therefore, the compounds that exhibit isomerism are known as isomers.
The word “isomer” is derived from the
Greek words “isos” and “meros”, which
mean “equal parts”. This term was coined by the Swedish chemist Jacob Berzelius
in the year 1830.
PROPERTIES OF ISOMERS
The properties of isomers are important
in fields such as chemistry, biochemistry, and pharmacology, where small
structural differences can have significant effects on the properties and
functions of molecules.
Physical properties of isomers
The physical properties of isomers can
vary depending on the structural arrangement of their atoms, and these
differences can be important in various fields such as materials science,
pharmacology, and environmental science.
1.
Melting and boiling points:
Isomers can have different melting and boiling points due to differences in
intermolecular forces. For example, branched alkanes have lower boiling points
than their corresponding straight-chain isomers because of decreased surface
area and weaker van der Waals forces.
CHEMICAL PROPERTIES OF ISOMERS
Chemical properties: Isomers can have
different chemical properties such as reactivity and stability. This is because
the different structural arrangements can affect the accessibility and
reactivity of functional groups.
There are two primary types of isomerism, which can be
further categorized into different subtypes. These primary types are Structural Isomerism and Stereoisomerism. The
classification of different types of isomers is illustrated below.
Structural isomerism is commonly referred to as
constitutional isomerism. The functional groups and the atoms in the molecules
of these isomers are linked in different ways. Different structural isomers are
assigned different IUPAC names since they may or may not contain the same
functional group.
The different types of structural isomerism are discussed
in this subsection.
·
It
is also known as skeletal isomerism.
·
The
components of these isomers display differently branched structures.
·
Commonly,
chain isomers differ in the branching of carbon
· An
example of chain isomerism can be observed in the compound C5H12, as
illustrated below.
This type of isomerism arises in compounds having the
same chemical formula but different orientations of the atoms belonging to the
molecule in three-dimensional space. The compounds that exhibit stereoisomerism
are often referred to as stereoisomers. This phenomenon can be further
categorized into two subtypes. Both these subtypes are briefly described in
this subsection.
posted by HUNTEMEN STANDARD ACADEMY @ April 14, 2023
0 Comments
Subscribe to
Posts [Atom]
