O LevelChemistryCambridge (CIE)Exam Questions11. Organic Chemistry11.7 Carboxylic Acids

Carboxylic Acids (Cambridge (CIE) O Level Chemistry): Multiple Choice Questions

Exam code: 5070

3 hours35 questions

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11.7 Carboxylic Acids

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1
1 mark

Dilute ethanoic acid is added separately to magnesium, to magnesium oxide and to magnesium carbonate.

From which substance is carbon dioxide produced?

  • magnesium only

  • magnesium oxide only

  • magnesium carbonate only

  • magnesium and magnesium carbonate

Choose your answer

2
1 mark

Zinc reacts with dilute ethanoic acid.

What is the name of the salt formed?

  • zinc ethanoate

  • zinc ethanoic acid

  • zinc carbonate

  • zinc hydroxide

Choose your answer

3
1 mark

Ethanol is oxidised to ethanoic acid in the laboratory.

Which reagent is used?

  • acidified aqueous potassium manganate(VII)

  • aqueous potassium manganate(V)

  • steam with an acid catalyst

  • aqueous sodium hydroxide

Choose your answer

4
1 mark

Vinegar is made by the oxidation of ethanol.

What is needed for this oxidation?

  • oxygen and bacteria

  • oxygen and yeast

  • bacteria in the absence of oxygen

  • yeast in the absence of oxygen

Choose your answer

5
1 mark

Ethanoic acid reacts with aqueous sodium hydroxide.

What are the only products of this reaction?

  • sodium ethanoate and hydrogen

  • sodium ethanoate and water

  • sodium ethanoate, carbon dioxide and water

  • sodium ethanoate and carbon dioxide

Choose your answer

1
1 mark

Which of these statements about carboxylic acids is not correct?

  • Aqueous ethanoic acid has a pH less than 7.

  • Methyl orange turns yellow in aqueous ethanoic acid.

  • They produce carbon dioxide when reacted with a metal carbonate.

  • They contain the functional group -COOH.

Choose your answer

2
1 mark

A carboxylic acid reacts with an alcohol in the presence of an acid catalyst.

Which products are formed?

  • Alkene and water

  • Alkane and water

  • Alcohol and water

  • Ester and water

Choose your answer

3
1 mark

Magnesium reacts with dilute ethanoic acid, CH3COOH.

What is the formula of the salt formed?

  • CH3COOMg

  • (CH3COO)2Mg

  • (CH3COOH)2Mg

  • Mg(OH)2

Choose your answer

4
1 mark

Propanoic acid reacts separately with magnesium, with magnesium oxide and with magnesium carbonate.

Which row gives the products of all three reactions correctly?

with magnesium

with magnesium oxide

with magnesium carbonate

A

salt + hydrogen

salt + water

salt + carbon dioxide

B

salt + water

salt + hydrogen

salt + carbon dioxide + water

C

salt + hydrogen

salt + water

salt + carbon dioxide + water

D

salt + hydrogen

salt + hydrogen

salt + carbon dioxide + water

    Choose your answer

    5
    1 mark

    Ethanol is warmed with the reagent used to oxidise it to ethanoic acid in the laboratory.

    What colour change is seen?

    • purple to colourless

    • colourless to purple

    • purple to brown

    • colourless to brown

    Choose your answer

    1
    1 mark

    The displayed formula of an ester is shown.

    H–C(=O)–O–C–C–C–C–H. Carbonyl carbon double-bonded to O and single-bonded to O and H. Four-carbon chain attached; terminal C has three H, internal C each two H.

    Which carboxylic acid and which alcohol react to form this ester?

    carboxylic acid

    alcohol

    A

    butanoic acid

    methanol

    B

    butanoic acid

    butan-1-ol

    C

    methanoic acid

    methanol

    D

    methanoic acid

    butan-1-ol

      Choose your answer

      2
      1 mark

      Three equations are written for reactions of propanoic acid, CH3CH2COOH.

      1 2CH3CH2COOH + Mg → (CH3CH2COO)2Mg + H2

      2 CH3CH2COOH + NaOH → CH3CH2COONa + H2

      3 2CH3CH2COOH + Na2CO3 → 2CH3CH2COONa + CO2 + H2O

      Which equations are correct?

      • 1 and 2 only

      • 1 and 3 only

      • 2 and 3 only

      • 1, 2 and 3

      Choose your answer

      3
      1 mark

      A salt has the formula (CH3CH2COO)2Ca.

      Which acid and which metal reacted together to form this salt?

      acid

      metal

      A

      ethanoic acid

      calcium

      B

      ethanoic acid

      potassium

      C

      propanoic acid

      calcium

      D

      propanoic acid

      potassium

        Choose your answer

        4
        1 mark

        Equal volumes of dilute ethanoic acid and dilute hydrochloric acid, both of concentration 0.1 mol / dm3, are added to separate samples of excess magnesium.

        Which statement about the two reactions is correct?

        • a smaller volume of hydrogen with ethanoic acid, and a slower reaction with it

        • the same volume of hydrogen with both acids, and the same rate for both acids

        • the same volume of hydrogen with both acids, but a slower reaction with ethanoic acid

        • a larger volume of hydrogen with ethanoic acid, and a slower reaction with it

        Choose your answer

        5
        1 mark

        0.020 mol of a carboxylic acid reacts exactly with 0.010 mol of magnesium. 0.010 mol of hydrogen is produced.

        Which conclusion follows?

        • Each molecule of the acid contains one COOH group.

        • Each molecule of the acid contains two COOH groups.

        • The acid and the magnesium react in a 1 : 1 ratio.

        • Half of the acid remained unreacted.

        Choose your answer