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.

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

96 questions
Question 1 of 20 96 total questions
Question 31
jamb 2022

Which of the following best represent solid gas mixture?

Amilk
Bkerosene
Csoil
Dsmoke
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Question 32
jamb 2022

When heat is absorbed during a chemical reaction, the reaction is said to be

Athermodynamic
Bexothermic
Cisothermal
Dendothermic
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Question 33
jamb 2022

The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?

AHC≡CCH\(_2\)CH\(_3\)
BCH\(_2\)≡CH\(_2\)CH\(_3\)
CCH\(_3\)C≡CCH\(_3\)
DCH\(_3\)CH=CHCH\(_3\)
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Question 34
jamb 2022

The pollutant usually presents in a city which generates its electricity from coal?

Afog
Bcarbon(ii)oxide
Csmog
Dsulphur(iv)oxide
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Question 35
jamb 2022

The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?

 

ACH\(_3\)CH\(_2\)COOH + KOH → CH\(_3\)CH\(_2\)COOK + H\(_2\)O
BNH\(_4\)OH + HCL → NH\(_4\) + H\(_2\)O
CNaOH + HCL → NaCL + H\(_2\)O
DCH\(_3\)COOH + NaOH → CH\(_3\)COONa + H\(_2\)O
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Question 36
jamb 2022

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. 

A31.6
B62.2
C32.7
D31.1
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Question 37
jamb 2022

In which of the following will hydrogen form ionic compound? 

AHCL
BNaH
CNH\(_3\)
DCH\(_4\)
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Question 38
jamb 2022

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

A85cm\(^3\)
B50cm\(^3\)
C125cm\(^3\)
D55cm\(^3\)
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Question 39
jamb 2022

An organic compound contains 69% carbon, 15.3% hydrogen and 30.7% oxygen. Calculate the the empirical formula [C=12, H = 1, O = 16]

AC\(_4\)H\(_12\)O
BC\(_3\)H\(_9\)O
CC\(_4\)H\(_9\)O
DC\(_3\)H\(_8\)O
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Question 40
jamb 2022

Crude petroleum is converted to useful products by the process of?

Afractional crystallization
Bfractional distillation
Cfiltration
Dchromatography
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Question 41
jamb 2022

An organic compound which decolorizes bromine water is likely to be?

AC\(_3\)H\(_8\)
BC\(_2\)H\(_6\)
CC\(_4\)H\(_10\)
DC\(_2\)H\(_4\)
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Question 42
jamb 2022

In order to electroplate spoon with silver, the arrangement of the electrolytic cell is?

Athe anode is a silver rod and the cathode is the spoon
Bthe anode is the spoon and the cathode is a silver rod
Cthe electrolyte is silver trioxonitrate(v)( solution and the cathode is a silver rod.
Dthe electrolyte is silver trioxonitrate(v) solution and the anode is the spoon
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Question 43
jamb 2022

A colored gas that is known to be poisonous and can readily damage the mucous lining of the lungs is?

Ahydrogen sulphide
Bcarbon(ii)oxide
Cchlorine
Dsulphur(iv)oxide
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Question 44
jamb 2022

An organic functional group which can likely decolorize ammoniacal silver nitrate is?

Aalkene
Balkane
Calkyne
Dalkanol
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Question 45
jamb 2022

Zn + 2HCL → ZnCl\(_2\) + H\(_2\) 

What happens to zinc in the above reaction?

Aoxidized
Ba reactant
Creduced
Da metal
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Question 46
jamb 2022

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\(_4\)?

ALow temperature and high pressure
BLow temperature and low pressure
Chigh temperature and low pressure
Dhigh temperature and high pressure
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Question 47
jamb 2022

An organic compound with fishy smell is likely to have a general formula?

ARCONH\(_2\)
B
CRNH\(_2\)
DRCOR\(^1\)
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Question 48
jamb 2022

Using the metal activity series, the metal that can liberate hydrogen gas from steam is?

Airon
Bcopper
Ctin
Dlead
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Question 49
jamb 2022

Addition of charcoal to the filter bed of sand during water treatment for township supply is to?

Aprevent goiter
Bprevent tooth decay
Cremove odour
Dkill germs
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Question 50
jamb 2022

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

Acu\(^{2+}\)
Bsn\(^{2+}\)
Cfe\(^{2+}\)
Dzn\(^{2+}\)
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