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Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

143 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

143 questions

Question 1 of 20 143 total questions

Question 11

neco 2001

Which of the following is TRUE of a catalyst? I. it alters the activation energy of a reaction
II. it is effective in a reaction but cannot initiate a reaction
III, it affects the equilibrium of a reversible reaction
IV. it affects the overall reaction

AI and II only

BI, II and III only

CII and III only

DII, II and IV only

EIII and IV only

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Question 12

neco 2001

The high boiling point of hydrogen fluoride can be explained in terms of

Acovalent bonds.

Bdative bonds.

Cdipole-dipole bonds.

Delectrovalent (ionic) bonds

Ehydrogen bonds.

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Question 13

neco 2001

The oxidation number of X in \(XO_{4}^{3-}\) is

B-2

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Question 14

neco 2001

How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]

A10.0 g

B4.0g

C2.0 g

D1 .0g

E0.1 g

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Question 15

neco 2001

What is the ratio of the rate of diffusion of carbon(IV) oxide to that of propane, under the same conditions? [H = 1; C= 12; 0= 161

A1:01

B1:10

C2:01

D2:03

E3:01

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Question 16

neco 2001

The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is

C10

D18

E32

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Question 17

neco 2001

On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns

Ablack

Bblue

Cgreen

Dwhite

Eyellow

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Question 18

neco 2001

Which compound is a product of the hydrolysis of the of CH\(_3\)COOC\(_3\)H\(_7\) with aqueous sodium hydroxide?

ACH₃COONa

BCH₃COONaCCH₃OH

CCH₃OH

DC₂H₅OH

EC₃H₇COONa

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Question 19

neco 2001

The alloy used for welding and plumbing contains

Aaluminum and copper.

Bcopper and tin

Ciron and aluminum.

Dlead and antimony.

Elead and tin.

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Question 20

neco 2001

in any chemical reaction, the total mass of products is always equal to that of the reactants.

This Is statement of the law of:

Aconservation of matter.

BConstant composition

Cdefinite proportions.

Dmultiple proportions.

Ereciprocal proportions.

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Question 21

neco 2001

Which metal will dissolve in aqueous sodium hydroxide?

Aaluminium

Bcopper

Ciron

Dsikeer

Etin

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Question 22

neco 2001

Which compound can be used as a reducing agent in a reaction?

ACl₂

BKMnO₄

CKCr₂O₇

DMnO₂

ENa₂SO₃

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Question 23

neco 2001

what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)

AArtificial radioactivity

Bnuclear fission

Cnuclear fusion

Dradio-decomposition

Espontaneous disintegration

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Question 24

neco 2001

The position of an element in the Periodic Table is determined by?

Aits atomic radius.

Bits density.

Cits relative atomic mass.

Dthe number of protons in its atom.

Ethe number of neutrons in its atoms

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Question 25

neco 2001

Which element contains the greatest number of moles?

A8 g of Helium

B48 g of Carbon

C78 g of Potassium

D130g of Zinc

E216g of Sliver

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Question 26

neco 2001

The use of sulphur to vulcanize rubber is made to make it

Ablacker.

Bcheaper. .

Cmore elastic

Dtougher

Esofter.

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Question 27

neco 2001

The atomic number of iron is 56. The number of unpaired electrons in the Fe3+ ion is

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Question 28

neco 2001

Animal charcoal differs from wood charcoal in that it

Ahas a dark colour

Bhas a high carbon content

Cis a good absorbent

Dis crystalline.

Eis rich in phosphate content

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Question 29

neco 2001

Which statement BEST describes the process of oxidation?

Aaddition of hydrogen

Bloss of oxygen

Cdecrease in oxidation number

Dloss of electrons

Egain of elections.

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Question 30

neco 2001

The decreasing order of the oxidising power of the halogens is

ABr>I>Cl>F

BF>I>Cl>Br

CF>Cl>Br>l

DI>Br>Cl>F

ECl>Br>F>I

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