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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.

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

168 questions
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Question 1 of 20 168 total questions
Question 71
neco 2001
An experiment to test the conductance of 0,1 M solutions of the substances listed below was perform.
I ammonia
II ammonium chloride
III ethanoic acid
IV sodium ethanoate
Which pair of substances show the least conductance?
AI and II
BI and III
CI and IV
DII and III
EII and IV
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Question 72
neco 2001
The best way to distinguish between Na2CO3and NaHCO2 is by.
Aadding an acid.
Badding an alkali.
Cdissolving in water.
Dexposing to air.
Eheating.
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Question 73
neco 2001
The Kinetic theory can NOT be used to explain
Aallotropy.
BBrownian movement.
Cdiffusion.
DTyndal effect.
Evaporization.
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Question 74
neco 2001

The molar mass of a compound X is 56. its empirical formula is CH2. X is

Abutene.
Bbutyne.
Cethene.
Dpropene.
Epropyne
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Question 75
neco 2001
Which compound will have the lowest boiling point?
ACH3OH
BCH3COOH
CCH3CHOH
DC4H10
E(CH3)3CH
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Question 76
neco 2001
The Atomic theory model which explains that electrons in an atom revolve round quantized energy levels is attributed to
ABecquerel.
BBohr.
Cde Broglie.
DRutherford.
EThompson.
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Question 77
neco 2001
White is NOT a property of metals?
Aductile:
Bmalleable
Cconduct heat and electricity
Dhave many oxidation states
Ehigh melting points anti boiling points
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Question 78
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 79
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 80
neco 2001

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

A1
B-2
C3
D4
E5
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Question 81
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 82
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 83
neco 2001
The maximum number of electrons that can occupy the shell having a principal quantum number of 3 is
A3
B9
C10
D18
E32
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Question 84
neco 2001
On exposure to hydrogen sulphide, moist lead (II) ethanoate paper turns
Ablack
Bblue
Cgreen
Dwhite
Eyellow
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Question 85
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 86
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 87
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 88
neco 2001
Which metal will dissolve in aqueous sodium hydroxide?
Aaluminium
Bcopper
Ciron
Dsikeer
Etin
View Explanation & Discuss
Question 89
neco 2001
Which compound can be used as a reducing agent in a reaction?
ACl2
BKMnO4
CKCr2O7
DMnO2
ENa2SO3
View Explanation & Discuss
Question 90
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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