WAEC Chemistry questions

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

1. Question 241· Non-metals and their compounds· WAEC

   Concentrated sulphuric acid chars sugar because it acts as a

   • Adehydrating agent
   • Breducing agent
   • Ccatalyst
   • Dbase

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2. Question 242· Organic compounds· WAEC

   Ethanol is produced industrially from sugar by

   • Apolymerisation
   • Bcracking
   • Cfermentation
   • Ddistillation of crude oil

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3. Question 243· Organic compounds· WAEC

   The general name for long-chain molecules made by joining many small units is

   • Apolymers
   • Bmonomers
   • Cisomers
   • Dalkanes

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4. Question 244· Organic compounds· WAEC

   What is the general formula of the alkenes?

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

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5. Question 245· Organic compounds· WAEC

   Fermentation of glucose by yeast produces

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

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6. Question 246· 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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7. Question 247· Organic compounds· WAEC

   Polythene is made from ethene by

   • Acondensation polymerisation
   • Baddition polymerisation
   • Csubstitution
   • Dfermentation

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8. Question 248· Organic compounds· WAEC

   Which of the following compounds is an alkanoic acid?

   • ACH₃COOH
   • BCH₃OH
   • CCH₃CHO
   • DC₂H₆

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9. Question 249· Organic compounds· WAEC

   Which reagent distinguishes ethene from ethane?

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

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10. Question 250· 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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11. Question 251· Organic compounds· WAEC

    The simplest organic compound is

    • Aethene
    • Bethane
    • Cmethane
    • Dethanol

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12. Question 252· Organic compounds· WAEC

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

    • Aesterification
    • Bpolymerisation
    • Ccracking
    • Dfermentation

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13. Question 253· Organic compounds· WAEC

    The functional group in alkanoic acids is

    • AC=C
    • B-OH
    • C-CHO
    • D-COOH

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14. Question 254· Organic compounds· WAEC

    Name the compound CH₃CH₂CH₂OH by the IUPAC system.

    • Apropanoic acid
    • Bpropanal
    • Cpropan-1-ol
    • Dpropane

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15. Question 255· Organic compounds· WAEC

    Ethanoic acid reacts with ethanol in the presence of concentrated H₂SO₄ to form

    • Aethyl ethanoate
    • Bethene
    • Cethane
    • Dcarbon dioxide

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16. Question 256· Organic compounds· WAEC

    Ethanol reacts with ethanoic acid in the presence of concentrated tetraoxosulphate(VI) acid to form

    • Aethyl ethanoate
    • Bethanal
    • Cethoxyethane
    • Dethene

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17. Question 257· Organic compounds· WAEC

    Polythene is made by

    • Acracking of starch
    • Bcondensation of glucose
    • Cfermentation
    • Daddition polymerisation of ethene

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18. Question 258· Organic compounds· WAEC

    The functional group of alkanoic acids is

    • AC=C
    • B–OH
    • C–CHO
    • D–COOH

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19. Question 259· Organic compounds· WAEC

    The reaction between an alkanoic acid and an alkanol produces

    • Acarbon dioxide and water
    • Ba salt and water
    • Can alkene
    • Dan ester and water

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20. Question 260· Organic compounds· WAEC

    Which of these is used to test for unsaturation in a hydrocarbon?

    • Alime water
    • Bbromine water
    • CFehling's solution
    • Diodine solution

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    Explanation and discussion