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.

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

50 questions
Question 1 of 10 50 total questions
Question 21
jamb 2005

What will happen if an aluminium spoon is used to stir a solution of iron (II) trioxonitrates (V)?

AThe spoon will be oxidized while the iron (II) ions will be reduced to the metal
BThe spoon will increase in size
CThe spoon will be reduced while the iron (II) ions will be oxidized
DThe spoon will be reduced
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Question 22
jamb 2005

What is the correct IUPAC name for NO\(_{2} ^{-}\)?

ADioxonitrate (IV) ion
BTrioxonitrate (III) ion
CTrioxonitrate (IV) ion
DDioxonitrate (III) ion
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Question 23
jamb 2005

When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of

ANaHSO4
BNa2SO3
CNaHSO3
DNa2SO4
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Question 24
jamb 2005

A concentrated solution containing H\(^+\), Cu\(^{2+}\), OH\(^-\) and Cl\(^-\) was electrolyzed using platinum electrodes.
The ion that will be discharged at the cathode is?

ACu2+
BCl-
CH+
DOH-
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Question 25
jamb 2005

2H\(_2\) + O\(_2\) → 2H\(_2\)O    ΔH = - 571kJ
In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?

A-1142 kJ
B-571 kJ
C+1142 kJ
D-1713 kJ
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Question 26
jamb 2005

In which of the following reactions can the oxidation number of the nitrogen be said to have increased?

A2NO(g) + O2(g) → 2NO2(g)
B2NO(g) + Cl2(g) → 2NOCl(l)
CFeSO4(aq) + NO(g) → Fe(NO)SO4(s)
DNO(g) + Br2(l) → 2NOBr(l)
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Question 27
jamb 2005

When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is

Aneutral
Bzero
Cpositive
Dnegative
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Question 28
jamb 2005

Phenolphthalein in acidic solution is

Ared
Borange
Ccolourless
Dyellow
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Question 29
jamb 2005

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

A4.0 moles of Cl-
B3.0 moles of Na+
C2.5 moles of Cu2+
D2.0 moles of Al3+
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Question 30
jamb 2005

Which of the following equimolar solutions will have the highest pH?

ACH3COOH
BNaOH
CHCl
DNH4OH
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