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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.

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

47 questions
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Question 1 of 7 47 total questions
Question 21
neco 2009

The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT

AHOCH2 – CH2OH
BH2C –C =C– CH3
CH3C – HC = CH2
DH2C = CH2
EH3C – C =CH
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Question 22
neco 2009

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

ACH
BCH3
CCH4
DC2H2
EC2H6
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Question 23
neco 2009
Which of the following non-metals reacts most readily with metals?
ACarbon
BChlorine
CNitrogen
DPhosphorus
ESulphur
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Question 24
neco 2009

Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group

Aalkanal
Balkane
Calkanoate
Dalkene
Ealkyne
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Question 25
neco 2009
The process involved in the decomposition of sugar by an enzyme is called
Adehydration
Besterification
Cfermentation
Dpolymerization
Esaponification
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Question 26
neco 2009
Which of the following equations is NOT balanced?
ACH4(g) + 202(9) → CO2(g) + 2H2O(g)
BCU(S) + HNO3(aq) → Cu(NO3)2(aq) + 4H2O(I) + NO(g)
C2KCIO3(s) → 2KCI(s)+ 3O2(g)
DNaH(s) + H2O(1) → NaOH(aq) +H2(g)
ENa2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2NaCl(aq)
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Question 27
neco 2009
A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is
Aammonia
Bcarbon(IV)oxide
Chydrogen chloride
Dsulphur (IV) oxide
Esulphur (VI) oxide
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