Acids and metals – Acid SpillRevision Questions

1. Which of the following pH values represents a neutral solution?

  1. 2
  2. 7
  3. 9
  4. 11

2. Which of the following oxides would dissolve in water to produce an acidic solution?

(You may wish to consult your data booklet)

  1. sulphur dioxide
  2. iron (III) oxide
  3. copper (II) oxide
  4. sodium oxide

3. Which of the following gases would dissolve in water to produce an alkaline solution?

  1. Carbon dioxide
  2. Nitrogen dioxide
  3. Ammonia
  4. Methane

4.

If [H+(aq)] = concentration of H+(aq) and

[OH¯ (aq)] = concentration of OH¯ (aq).

Which of the following is true for an acidic solution?

  1. [H+(aq)] is greater than [OH¯ (aq)]
  2. [H+(aq)] is less than [OH¯ (aq)]
  3. [H+(aq)] is equal to [OH¯ (aq)]
  4. none of the above

5. In water the following equilibrium exists

H2O (l) H+(aq) + OH¯ (aq)

Which of the following is true?

  1. Water exists only as ions
  2. Water exists mainly as molecules but contains a very small number ions
  3. The concentration of ions in water is constantly changing
  4. Water exists mainly as ions but contains a very small number molecules

6. The volume of a 2 mol l-1 solution of potassium hydroxide that contains 0.5 mol of solute is

  1. 125 cm3
  2. 250 cm3
  3. 500 cm3
  4. 1000 cm3

7. The pH value for sodium hydroxide would be expected to be about

  1. 0
  2. 3
  3. 7
  4. 14

8. Bases which dissolve in water, form

  1. alkalis
  2. acids
  3. alcohols
  4. esters

9. The test for hydrogen gas is that it

  1. turns limewater cloudy
  2. puts out a burning splint
  3. burns with a "pop"
  4. relights a glowing splint

10. The two main gases responsible for acid rain are

  1. carbon monoxide and ozone
  2. nitrogen dioxide and sulphur dioxide
  3. CFCs and ozone
  4. Methane and carbon monoxide

11.

H2SO4 + 2NaOH  Na2SO4 + 2H2O

The volume of 1 mol l-1 sodium hydroxide required to neutralise 25 cm3 of

0.5 mol l-1 sulphuric acid is

  1. 10 cm3
  2. 12.5 cm3
  3. 25 cm3
  4. 50 cm3

12.

H2SO4 + 2NaOH  Na2SO4 + 2H2O

50 cm3 of sodium hydroxide neutralised 12.5 cm3 of 1 mol l-1 sulphuric acid. The concentration of the sodium hydroxide is

  1. 0.1 mol l-1
  2. 0.2 mol l-1
  3. 0.5 mol l-1
  4. 1.0 mol l-1

The following apply to questions 13 to 15.

  1. Hydrogen ions and hydroxide ions form water
  2. Hydrogen ions and oxide ions form water
  3. Hydrogen ions and carbonate ions form water and carbon dioxide
  4. Hydrogen ions and metal atoms take part in a redox reaction

13 Which of the above takes place in the reaction of an acid with a metal oxide?

14. Which of the above takes place in the reaction of an acid with a metal carbonate?

15 Which of the above takes place in the reaction of an acid with an alkali?

16 Which of the following is the best description of a salt?

  1. An acid with the hydrogen replaced by a metal
  2. An acid with the hydrogen ions replaced by metal ions or ammonium ions
  3. An acid that has been neutralised by an alkali
  4. An acid with the hydrogen ions replaced by ammonium ions

17 The salts formed by nitric acid are called

  1. chlorides
  2. ethanoates
  3. nitrates
  4. sulphates

18 In the reaction between nitric acid and zinc oxide, one of the products is zinc nitrate, the other product is

  1. carbon dioxide
  2. water
  3. hydrogen
  4. oxygen

19 In the reaction between sulphuric acid and potassium hydroxide, one of the products is potassium sulphate, the other product is

  1. carbon dioxide
  2. water
  3. hydrogen
  4. oxygen

20. In the reaction between sodium hydroxide and nitric acid, the spectator ions are

  1. Na+(aq) and NO3¯(aq)
  2. NO3¯(aq) and H+(aq)
  3. H+(aq) and OH¯(aq)
  4. OH¯(aq) and Na+(aq)