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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.

4,306 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

4,306 questions
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Question 1 of 20 4,306 total questions
Question 1731
jamb 1992
A given mass of gas occupies 2 dm2 at 300k. At what temperature will its volume be doubled keeping the pressure constant?
A400k
B480k
C550k
D600k
View Explanation & Discuss
Question 1732
jamb 1992

Which of the following compounds is a secondary alkanol?

AA
BB
CC
DD
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Question 1733
jamb 1992

In the experiment above. Z can be

Aa solution of sodium dioxonitrate (lll) and ammonium chloride
Ba solution of lead trioxnitrate (V)
Ca solution of sodium trioxonitrate (V) and ammonium chloride
Dconcentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)
View Explanation & Discuss
Question 1734
jamb 1992
An example of a polysaccharides is?
A—dextrose
Bmannose
Cglucose
Dstarch
View Explanation & Discuss
Question 1735
jamb 1992
Alkanals can be differentiated from alkanones by reaction with?
A2,4-dinitrophenylhydrazine
Bhydrogen cyanide
Csodium hydrogen sulphite
DTollen's reagent
View Explanation & Discuss
Question 1736
jamb 1992
The characteristics reaction of carbonyl compounds is?
Asubstitution
Belimination
Caddition
Dsaponfication
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Question 1737
jamb 1992
An organic compound containing 40.1% carbon and 6.6% hydrogen has an empirical formula of?
AC2H4O2
BC2H3O2
CCH2O
DCH3O
View Explanation & Discuss
Question 1738
jamb 1992
The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO3 is?
Ahydroxyl group
Bcarboalkoxyl group
Ccarbonyl group
Dcarboxyl group
View Explanation & Discuss
Question 1739
jamb 1992
Which of the following are isomers?
AEthanol and dimethyl ether
BBenzene and methybenzene
CEthanol and propanone
DTrichloromethane and tetrachloromethane
View Explanation & Discuss
Question 1740
jamb 1992

Which of the following compounds reacts with sodium metal as well as silver and copper salts ?

ACH3C Ξ C—CH3
BCH3CH2CH2
CCH3C Ξ CH
DCH3CH = CH CH3
View Explanation & Discuss
Question 1741
jamb 1992

The carbon atoms in ethene are?

Asp3 hybridized
Bsp hybridized
Csp2 hybridized
Dnot hybridized
View Explanation & Discuss
Question 1742
jamb 1992
CaOs + H2O(l) → Ca(OH)2(s) ΔH -65 kj. The process represented by the above equation is known as?
Adissolution
Bslaking
Climing
Dmortaring
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Question 1743
jamb 1992
Duralumin consists of aluminium, copper, ?
Azinc and gold
Blead and maganese
Cnickle and silver
Dmanganese and magnesium
View Explanation & Discuss
Question 1744
jamb 1992
Which of the following is NOT used as a raw material in the Solvay process?
AAmmonia
BSodium chloride
CCalcium trioxocarbonate (IV)
DSodium trioxocarbonate (IV)
View Explanation & Discuss
Question 1745
jamb 1992

Sodium hydroxide solution can be conveniently stored in a container made of?

Alead
Bzinc
Caluminium
Dcopper
View Explanation & Discuss
Question 1746
jamb 1992
Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?
Anitrate
Bcarbonate
Cchloride
Dsulphide
View Explanation & Discuss
Question 1747
jamb 1992

Safety matches contain sulphur and the following except?

Asodium chloride
Bpotassium trioxonitrate (V)
Ccharcoal
Dphosphorus sulphide
View Explanation & Discuss
Question 1748
jamb 1992

The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?

Ahydrogen
Bnitrogen (IV) oxide
Coxygen
Dammonia
View Explanation & Discuss
Question 1749
jamb 1992
The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?
Ahydrogen
Bnitrogen (IV) oxide
Coxygen
Dammonium
View Explanation & Discuss
Question 1750
jamb 1992
Which of the following oxides of nitrogen is unstable in air?
ANO2
BNO
CN2O4
DN2O5-
View Explanation & Discuss
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