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Chemistry Past Questions

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50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

50 questions

Question 1 of 20 50 total questions

Question 1

jamb 2016

N₂O_4(aq) \(\rightleftharpoons\) 2NO_2(g) \(\bigtriangleup\)H = +ve

In the reaction above, an increase in temperature will

AIncrease the reactant production

BIncrease the value of the equilibrium constant

CShift the equilibrium to the left

DDecrease the value of the equilibrium constant

View Explanation & Discuss

Question 2

jamb 2016

CH_4(g) + CI_2(g) \(\to\) CH₂CI_(s) + HCI_g

The major factor that influences the rate of the reaction above is

AConcentration

BCatalyst

CTemperature

DLight

View Explanation & Discuss

Question 3

jamb 2016

From the diagram above, an ideal gas can be represented by

View Explanation & Discuss

Question 4

jamb 2016

The curve depicts titration between a strong acid of pH

AStrong acid and strong base

BStrong acid and weak base

CWeak acid and weak base

DWeak acid and strong base

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Question 5

jamb 2016

The diagram represents

AA spontaneous reaction

BAn exothermic reaction

CA non-spontaneous

DAn endothermic reaction

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Question 6

jamb 2016

In the diagram above, X is the

AEnthalphy

BActivated complex

CActivation energy

DEnthalphy change

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Question 7

jamb 2016

The functional groups present in the compound above are

AAlkene and halo-group

BHydroxyl and chloro-group

CAlkene and chloro-group

DHydroxyl and halo-group

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Question 8

jamb 2016

n monosaccharide \( \underset{Q}{\stackrel{P}{\rightleftharpoons}} \) polysaccharide -n water.

In the process above, P and Q respectively represent

ACondensation and hydrolysis

BFermentation and condensation

CPolymerization and hydrolysis

DPolymerization and condensation

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Question 9

jamb 2016

The compound above exhibits

AGeometric isomerism

BPositional isomerism

CStructural isomerism

DOptical isomerism

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Question 10

jamb 2016

MnO\(_4\)(aq) + Y + 5Fe\(^{2+}\) (aq) \(\mapsto\) Mn\(^{2+}\) (aq) + 5Fe\(^{3+}\) (aq) + 4H\(_2\)O (l).

In the equation above, Y is

A10H⁺ _(aq)

B5H⁺ _(aq)

C8H⁺ _(aq)

D4H⁺ _(aq)

View Explanation & Discuss

Question 11

jamb 2016

A chemical reaction in which the hydration energy is greater than the lattice energy is referred to as

AA reversible reaction

BA spontenous reaction

CAn endothermic reaction

DAn exothermic reaction

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Question 12

jamb 2016

The gas that is used for the treatment of cancer is

ANeon

BRadon

CXenon

DArgon

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Question 13

jamb 2016

Calculate the volume in cm³ of oxygen evolved at s.t.p when a current of 5A is passed through acidified water for 193s?
[F = 96500 C mol¹. Molar volume of a gas at s.t.p = 22.4dm³]

A0.056dm³

B0.224dm³

C224.000dm³

D56.000dm³

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Question 14

jamb 2016

An isotope has an atomic number of 15 and a mass number of 31. The number of proton it contains is

A16

B15

C31

D46

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Question 15

jamb 2016

An example of a solid emulsion is

AButter

BHair cream

CMilk

DCod-liver oil

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Question 16

jamb 2016

In a neutralization reaction involving HCI and NaOH using litmus as indicator, the colour at the end point is

ABlue

BRed

COrange

DPurple

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Question 17

jamb 2016

In the extraction of iron, the waste gas from the furnace is a mixture of

APH₃ CO and CO₂

BCO and C

CN₂ , CO and CO₂

DPH₃ and CO

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Question 18

jamb 2016

The arrangement of particles in crystal lattices can be studied using

AX-rays

B\(\beta\)-rays

C\(\alpha\)-rays

D\(\gamma\)-rays

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Question 19

jamb 2016

The drying agent suitable for drying ammonia is

ACalcium Chloride

BCalcium Oxide

CPhosphorus(V) Oxide

DConcentrated H₂SO₄

View Explanation & Discuss

Question 20

jamb 2016

The number of electronic shells contained in an atom with electron configuration 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^6\)4S\(^2\) is

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