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.

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

46 questions
Question 1 of 20 46 total questions
Question 11
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 12
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 13
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 14
jamb 2022

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

Aalkene
Balkane
Calkyne
Dalkanol
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Question 15
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 16
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 17
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 18
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 19
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 20
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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Question 21
jamb 2022

A chemical widely used as a fertilizer is?

Agalena
Bbauxite
Cemerald
Dnitrochalk
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Question 22
jamb 2022

Addition of sodium chloride to water to form a solution would  lead to?

Aincrease in freezing point and increase the boiling point
Bincrease in freezing point and decrease the boiling point
Cdecrease in freezing point and decrease the boiling point
Ddecrease in freezing point and increase the boiling point
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Question 23
jamb 2022

An organic compound which liberate carbon(iv)oxide from trioxocarbonate(iv) solution is likely to be?

AC\(_2\)H\(_5\)OH
BC\(_3\)H\(_4\)
CC\(_6\)H\(_6\)
DCH\(_3\)COOH
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Question 24
jamb 2022

The sulphide that is commonly used in coating electric fluorescent tubes is?

Airon(ii)Sulphide
Btin(ii)sulphide
CZinc Sulphide
Dlead(iv) Sulphide
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Question 25
jamb 2022

How many neutrons are present in atom with mass number and atomic number 37 and 17 respectively?

A18
B20
C37
D17
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Question 26
jamb 2022

The following non-metal form acidic oxides with oxygen except?

Aphosphorus
Bsulphur
Ccarbon
Dchlorine
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Question 27
jamb 2022

In the preparation of salts, the method employed will depend on the?

Acomposition
Bdissociating ability
Cstability to heat
Dprecipitating ability
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Question 28
jamb 2022

SO\(_2\) + O\(_2\) → 2SO\(_3\)

In the reaction above, the most suitable catalyst is?

Achromium(vi)oxide
Biron(iii)oxide
Ccopper(i)oxide
Dvanadium(v)oxide
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Question 29
jamb 2022

 

The IUPAC nomenclature of the structure is?

A3-chloro-3-methylbutane
B2,2,-dichloro-3-methylbutane
C3-methylchlorobutane
D2-chloro-2-methylbutane
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Question 30
jamb 2022

The sub-atomic particles located in the nucleus of an atom are?

Aneutron and proton
Bproton and electron
Cproton and ions
Dneutron and electron
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