Chemistry past questions: JAMB UTME 2022

39 objective questions, with answers. Free to read and practise.

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39 questions, one at a time, marked as you go or at the end. No account needed.

1.
GAS CO \(_2\) N \(_2\) O \(_2\)
% BY VOLUME 4 72 24
The above table shows the compositions of the atmosphere of planet X. Which of these gases are present in higher percentages on earth?
1. A.CO \(_2\) and O \(_2\)
2. B.N \(_2\) and CO \(_2\)
3. C.CO \(_2\) , O \(_2\) and N \(_2\)
4. D.O \(_2\) and N \(_2\)
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Answer: D O \(_2\) and N \(_2\)
2.
2-methylprop-1-ene is a structural isomer of?
1. A.But-1-yne
2. B.2-methyl But-1-ene
3. C.3-methyl prop-1-yne
4. D.But-2-ene
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Answer: D But-2-ene
3.
2H \(_2\) + O \(_2\) → 2H \(_2\) O From the equation above, calculate the volume of unreacted oxygen gas if a mixture of 50cm \(^3\) of hydroden and 75cm \(^3\) of oxygen are involved
1. A.85cm \(^3\)
2. B.50cm \(^3\)
3. C.125cm \(^3\)
4. D.55cm \(^3\)
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Answer: C 125cm \(^3\)
4.
A chemical widely used as a fertilizer is?
1. A.galena
2. B.bauxite
3. C.emerald
4. D.nitrochalk
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Answer: D nitrochalk
5.
A colored gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?
1. A.hydrogen sulphide
2. B.carbon(ii)oxide
3. C.chlorine
4. D.sulphur(iv)oxide
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Answer: C chlorine
6.
Addition of charcoal to the filter bed of sand during water treatment for township supply is to?
1. A.prevent goiter
2. B.prevent tooth decay
3. C.remove odour
4. D.kill germs
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Answer: C remove odour
7.
Addition of sodium chloride to water to form a solution would lead to?
1. A.increase in freezing point and increase the boiling point
2. B.increase in freezing point and decrease the boiling point
3. C.decrease in freezing point and decrease the boiling point
4. D.decrease in freezing point and increase the boiling point
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Answer: D decrease in freezing point and increase the boiling point
8.
Alkanes are used mainly?
1. A.in the textile industry
2. B.in the hydrogenation of oils
3. C.as domestic and industrial fuels
4. D.as fine chemicals
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Answer: C as domestic and industrial fuels
9.
An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]
1. A.C \(_4\) H \(_12\) O
2. B.C \(_3\) H \(_9\) O
3. C.C \(_4\) H \(_9\) O
4. D.C \(_3\) H \(_8\) O
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Answer: D C \(_3\) H \(_8\) O
10.
An organic compound which decolorizes bromine water is likely to be?
1. A.C \(_3\) H \(_8\)
2. B.C \(_2\) H \(_6\)
3. C.C \(_4\) H \(_10\)
4. D.C \(_2\) H \(_4\)
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Answer: B C \(_2\) H \(_6\)
11.
An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?
1. A.C \(_2\) H \(_5\) OH
2. B.C \(_3\) H \(_4\)
3. C.C \(_6\) H \(_6\)
4. D.CH \(_3\) COOH
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Answer: D CH \(_3\) COOH
12.
An organic functional group which can likely decolorize ammoniacal silver nitrate is?
1. A.alkene
2. B.alkane
3. C.alkyne
4. D.alkanol
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Answer: C alkyne
13.
Crude petroleum is converted to useful products by the process of?
1. A.fractional crystallization
2. B.fractional distillation
3. C.filtration
4. D.chromatography
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Answer: B fractional distillation
14.
Electrons enter into orbitals in order of increasing energy as exemplified by?
1. A.1S \(^2\) 2S \(^2\) 2PX \(^2\) 2py \(^2\) 2pz \(^0\) 3s \(^0\)
2. B.1S \(^2\) 2S \(^2\) 2PX \(^2\) 2py \(^1\) 2pz \(^1\) 3s \(^0\)
3. C.1S \(^2\) 2S \(^2\) 2PX \(^1\) 2py \(^1\) 2pz \(^1\) 3s \(^1\)
4. D.1S \(^2\) 2S \(^2\) 2PX \(^2\) 2py \(^2\) 2pz \(^0\) 3s \(^1\)
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Answer: B 1S \(^2\) 2S \(^2\) 2PX \(^2\) 2py \(^1\) 2pz \(^1\) 3s \(^0\)
15.
H \(^+\) + OH \(^-\) → H \(_2\) O The equation above illustrates
1. A.precipitation
2. B.hydration
3. C.hydrolysis
4. D.neutralization
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Answer: D neutralization
16.
Hard water is water with high concentrations of dissolved ions, in particular calcium and
1. A.magnesium ions
2. B.nitrogen ions
3. C.phosporus ions
4. D.helium ions
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Answer: A magnesium ions
17.
How many bonding pair are present in carbon(iv)oxide?
1. A.4
2. B.3
3. C.2
4. D.1
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Answer: A 4
18.
How many neutrons are present in atom with mass number and atomic number 37 and 17 respectively?
1. A.18
2. B.20
3. C.37
4. D.17
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Answer: B 20
19.
If the volume of a given mass of a gas at 0ºc is 29.5cm \(^3\) . What will be the volume of the gas at 15ºc, given that the pressure remains constant.
1. A.31.6
2. B.62.2
3. C.32.7
4. D.31.1
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Answer: D 31.1
20.
In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?
1. A.the anode is a silver rod and the cathode is the spoon
2. B.the anode is the spoon and the cathode is a silver rod
3. C.the electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod
4. D.the electrolyte is silver trioxonitrate(v) solution and the anode is the spoon
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Answer: A the anode is a silver rod and the cathode is the spoon
21.
In the extraction of iron, hot air is introduced into the blast furnace through?
1. A.valves
2. B.open-hearths
3. C.arcs
4. D.tuyeres
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Answer: C arcs
22.
In the preparation of salts, the method employed will depend on the?
1. A.composition
2. B.dissociating ability
3. C.stability to heat
4. D.precipitating ability
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Answer: C stability to heat
23.
In which of the following will hydrogen form ionic compound?
1. A.HCL
2. B.NaH
3. C.NH \(_3\)
4. D.CH \(_4\)
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Answer: B NaH
24.
N \(_2\) O \(_4\) ⇔ 2NO \(_2\) (Δ = -ve) From the reaction above, which of these conditions would produce the highest equilibrium yield for N \(_2\) O \(_4\) ?
1. A.Low temperature and high pressure
2. B.Low temperature and low pressure
3. C.high temperature and low pressure
4. D.high temperature and high pressure
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Answer: C high temperature and low pressure
25.
On the basis of the electrochemical series, which of these ions will show the greater tendency to be discharged at the cathode in an electrolytic cell
1. A.cu \(^{2+}\)
2. B.sn \(^{2+}\)
3. C.fe \(^{2+}\)
4. D.zn \(^{2+}\)
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Answer: A cu \(^{2+}\)
26.
SO \(_2\) + O \(_2\) → 2SO \(_3\) In the reaction above, the most suitable catalyst is?
1. A.chromium(vi)oxide
2. B.iron(iii)oxide
3. C.copper(i)oxide
4. D.vanadium(v)oxide
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Answer: D vanadium(v)oxide
27.
The dehydration of CH \(_3\) CH \(_2\) CH \(_2\) CH \(_2\) OH will give?
1. A.HC≡CCH \(_2\) CH \(_3\)
2. B.CH \(_2\) ≡CH \(_2\) CH \(_3\)
3. C.CH \(_3\) C≡CCH \(_3\)
4. D.CH \(_3\) CH=CHCH \(_3\)
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Answer: D CH \(_3\) CH=CHCH \(_3\)
28.
The following non-metal form acidic oxides with oxygen except?
1. A.phosphorus
2. B.sulphur
3. C.carbon
4. D.chlorine
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Answer: D chlorine
29.
The IUPAC nomenclature of the structure is?
1. A.3-chloro-3-methylbutane
2. B.2,2,-dichloro-3-methylbutane
3. C.3-methylchlorobutane
4. D.2-chloro-2-methylbutane
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Answer: D 2-chloro-2-methylbutane
30.
The pollutant usually presents in a city which generates its electricity from coal?
1. A.fog
2. B.carbon(ii)oxide
3. C.smog
4. D.sulphur(iv)oxide
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Answer: D sulphur(iv)oxide
31.
The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?
1. A.CH \(_3\) CH \(_2\) COOH + KOH → CH \(_3\) CH \(_2\) COOK + H \(_2\) O
2. B.NH \(_4\) OH + HCL → NH \(_4\) + H \(_2\) O
3. C.NaOH + HCL → NaCL + H \(_2\) O
4. D.CH \(_3\) COOH + NaOH → CH \(_3\) COONa + H \(_2\) O
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Answer: C NaOH + HCL → NaCL + H \(_2\) O
32.
The sub-atomic particles located in the nucleus of an atom are?
1. A.neutron and proton
2. B.proton and electron
3. C.proton and ions
4. D.neutron and electron
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Answer: A neutron and proton
33.
The sulphide that is commonly used in coating electric fluorescent tubes is?
1. A.iron(ii)Sulphide
2. B.tin(ii)sulphide
3. C.Zinc Sulphide
4. D.lead(iv) Sulphide
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Answer: C Zinc Sulphide
34.
Using the metal activity series, the metal that can liberate hydrogen gas from steam is?
1. A.iron
2. B.copper
3. C.tin
4. D.lead
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Answer: A iron
35.
What volume of (dm \(^3\) ) of water will be added to 10dm \(^3\) of 2.0 mol/dm \(^3\) HCL acid solution to give a final solution of 0.5 mol/dm \(^3\) ?
1. A.30
2. B.40
3. C.20
4. D.50
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Answer: A 30
36.
When heat is absorbed during a chemical reaction, the reaction is said to be
1. A.thermodynamic
2. B.exothermic
3. C.isothermal
4. D.endothermic
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Answer: D endothermic
37.
Which of the following best represent solid gas mixture?
1. A.milk
2. B.kerosene
3. C.soil
4. D.smoke
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Answer: B kerosene
38.
Wrought iron is obtained by heating cast iron in a furnace with?
1. A.magnetite
2. B.haematite
3. C.carbon(ii)oxide
4. D.calcium trioxosilicate(iv)
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Answer: D calcium trioxosilicate(iv)
39.
Zn + 2HCL → ZnCl \(_2\) + H \(_2\) What happens to zinc in the above reaction?
1. A.oxidized
2. B.a reactant
3. C.reduced
4. D.a metal
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Answer: A oxidized

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GAS	CO \(_2\)	N \(_2\)	O \(_2\)
% BY VOLUME	4	72	24