JAMB and WAEC Chemistry questions

800 questions with answers and explanations. Tap an option to check yourself.

1. Question 541· Organic compounds· JAMB

   Ethanol oxidised by acidified potassium heptaoxodichromate(VI) first gives

   • Aethane
   • Bethene
   • Cethanal
   • Dmethanol

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   Answer: C. ethanal

   Explanation and discussion

2. Question 542· Organic compounds· JAMB

   The products of the complete combustion of ethane are

   • Acarbon and hydrogen
   • Bcarbon(IV) oxide and water
   • Ccarbon(II) oxide only
   • Dethene and hydrogen

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   Answer: B. carbon(IV) oxide and water

   Explanation and discussion

3. Question 543· Organic compounds· JAMB

   In the fermentation of sugar to ethanol, the enzymes are supplied by

   • Athe stomach
   • Bbacteria in milk
   • Cyeast
   • Dsaliva

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   Answer: C. yeast

   Explanation and discussion

4. Question 544· Organic compounds· WAEC

   Fermentation of glucose by yeast produces

   • Aethanoic acid
   • Bmethanol and oxygen
   • Cethanol and carbon dioxide
   • Dethene

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   Answer: C. ethanol and carbon dioxide

   Explanation and discussion

5. Question 545· Organic compounds· WAEC

   Alkenes differ from alkanes because alkenes contain

   • Aan –OH group
   • Bonly single bonds
   • Ca carbon–carbon double bond
   • Da carboxyl group

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   Answer: C. a carbon–carbon double bond

   Explanation and discussion

6. Question 546· Organic compounds· WAEC

   Polythene is made from ethene by

   • Acondensation polymerisation
   • Baddition polymerisation
   • Csubstitution
   • Dfermentation

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   Answer: B. addition polymerisation

   Explanation and discussion

7. Question 547· Organic compounds· WAEC

   Which of the following compounds is an alkanoic acid?

   • ACH₃COOH
   • BCH₃OH
   • CCH₃CHO
   • DC₂H₆

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   Answer: A. CH₃COOH

   Explanation and discussion

8. Question 548· Organic compounds· JAMB

   The complete hydrolysis of starch produces

   • Aamino acids
   • Bethanol
   • Cglycerol
   • Dglucose

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   Answer: D. glucose

   Explanation and discussion

9. Question 549· Organic compounds· WAEC

   Which reagent distinguishes ethene from ethane?

   • Asodium chloride solution
   • Blime water
   • Cdilute hydrochloric acid
   • Dbromine water

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   Answer: D. bromine water

   Explanation and discussion

10. Question 550· Organic compounds· JAMB

    The general formula of the alkanols is

    • ACₙH₂ₙ₊₁COOH
    • BCₙH₂ₙ
    • CCₙH₂ₙ₊₂
    • DCₙH₂ₙ₊₁OH

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    Answer: D. CₙH₂ₙ₊₁OH

    Explanation and discussion

11. Question 551· Organic compounds· JAMB

    The reaction between methane and chlorine in sunlight is

    • Aesterification
    • Baddition
    • Cpolymerisation
    • Dsubstitution

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    Answer: D. substitution

    Explanation and discussion

12. Question 552· Organic compounds· WAEC

    Saponification is the reaction between

    • Aan alkene and hydrogen
    • Ban alcohol and an acid
    • Ca fat or oil and an alkali
    • Da sugar and yeast

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    Answer: C. a fat or oil and an alkali

    Explanation and discussion

13. Question 553· Organic compounds· JAMB

    Members of a homologous series

    • Ahave identical boiling points
    • Bhave the same molecular formula
    • Chave the same general formula and differ by CH₂
    • Dcontain no carbon

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    Answer: C. have the same general formula and differ by CH₂

    Explanation and discussion

14. Question 554· Organic compounds· JAMB

    Acidified potassium tetraoxomanganate(VII) is decolourised by

    • Aethene
    • Bethane
    • Cmethane
    • Dcarbon(IV) oxide

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    Answer: A. ethene

    Explanation and discussion

15. Question 555· Organic compounds· JAMB

    The functional group of the alkanoic acids is

    • A–OH
    • B–COOH
    • C–CHO
    • D–COO–

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    Answer: B. –COOH

    Explanation and discussion

16. Question 556· Organic compounds· JAMB

    The compound CH₃COOH is:

    • Aethanoic acid
    • Bethanal
    • Cethanol
    • Dmethanoic acid

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    Answer: A. ethanoic acid

    Explanation and discussion

17. Question 557· Organic compounds· WAEC

    The simplest organic compound is

    • Aethene
    • Bethane
    • Cmethane
    • Dethanol

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    Answer: C. methane

    Explanation and discussion

18. Question 558· Organic compounds· WAEC

    Long-chain hydrocarbons are broken into smaller, more useful molecules by

    • Aesterification
    • Bpolymerisation
    • Ccracking
    • Dfermentation

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    Answer: C. cracking

    Explanation and discussion

19. Question 559· Organic compounds· JAMB

    Benzene undergoes mainly

    • Aaddition reactions only
    • Bsubstitution reactions
    • Cpolymerisation
    • Delimination

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    Answer: B. substitution reactions

    Explanation and discussion

20. Question 560· Organic compounds· JAMB

    The alkaline hydrolysis of fats and oils (saponification) produces

    • Amargarine
    • Bethanol and water
    • Csoap and glycerol
    • Desters only

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    Answer: C. soap and glycerol

    Explanation and discussion