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.

137 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

137 questions
Question 1 of 17 137 total questions
Question 61
jamb 2018

The periodic classification is an arrangement of the elements

Aatomic weights
Bisotopic weights
Cmolecular weights
Datomic numbers
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Question 62
jamb 2018

Which of the following statements is correct about the periodic table?

AElements in the same period have the same number of valence electrons
BThe valence electrons of the elements in the same period increase progressively across the period
CElements in the same group have the same number of electron shells
DThe non-metallic Properties of the elements tend to decrease across each period
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Question 63
jamb 2018

On which of the following is the solubility of a gaseous substance dependent? 
I. Nature of solvent 
II. Nature of solute 
III. Temperature 
IV. Pressure

AI, II, III and IV
BI and II only
CII only
DIII and IV only
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Question 64
jamb 2018

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

Acollisions are perfectly elastic
Bforces of repulsion exist
Cforces of repulsion and attraction are in equilibrium
Dcollisions are inelastic
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Question 65
jamb 2018

A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

AAl and Mg
BZn and Fe
CZn and Pb
DPb and H
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Question 66
jamb 2018

The Consecutive members of an alkane homologous series differ by

ACH
BCH\(_2\)
CCH\(_3\)
DC\(_n\)H\(_n\)
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Question 67
jamb 2018

Which of the following gases may not be dried with concentrated sulphuric acid?

AHCl\(_{(g)}\)
BNH\(_3\)
CCl\(_2\)
DSO\(_2\)
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Question 68
jamb 2018

An element used in the production of matches is

Anitrogen
Baluminium
Ccopper
Dsulphur
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Question 69
jamb 2018

According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to

Adecrease
Bincrease
Cbe zero
Dremain constant
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Question 70
jamb 2018

To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

A298K
B546K
C819K
D1092K
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Question 71
jamb 2018

Which of the following is an example of a chemical change?

Adissolution of salt in water
Brusting of iron
Cmelting of ice
Dseparating a mixture by distillation
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Question 72
jamb 2018

The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is 

Acoordinate
Belectrovalent
Cmetallic
Dcovalent
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Question 73
jamb 2018

What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide

A14
B13
C12
D11
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Question 74
jamb 2018

The Sulphide which is insoluble in dilute hydrochloric acid is

AFeS
BCuS
CZnS
DNa2S
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Question 75
jamb 2018

A substance that is used as a ripening agent for fruits is

Aethene
Bpropane
Cmethane
Dbutane
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Question 76
jamb 2018

According to Charles' law, the volume of a gas becomes zero at

A0°C
B-100°C
C-273°C
D-373°C
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Question 77
jamb 2018

A given amount of gas occupies 10.0dm\(^3\) at 4 atm and 273°C. The number of moles of the gas present is?

[Molar volume of gas at s.t.p = 22.4 dm\(^3\)]

A0.89 mol
B1.90 mol
C3.80 mol
D5.70 mol
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