O level Chemistry Questions and Answers(4)

Question 1

Choose from the following substances to answer the questions below .

  • copper(II) chloride
  • chlorine
  • ethanoic acid
  • hydrochloric acid
  • manganese(IV) oxide
  • platinum
  • potassium dichromate(VI)
  • sodium chloride
  • sulphuric acid
  • vanadium(V) oxide

Each substance can be used once, more than once or not at all.

Name a substance which
(a) is a catalyst in the Contact process[1] (b) is a weak acid. [1] (c) can be used in the test for sulfur dioxide. [1] (d) reacts with aqueous potassium iodide to give a brown colour[1]

Solution 1

(a) vanadium(V) oxide
(b) ethanoic acid
(c) potassium dichromate(IV)
(d) chlorine



Question 2

Choose from the following gases to answer the questions below.

  • ammonia
  • argon
  • carbon monoxide
  • chlorine
  • hydrogen
  • nitrogen
  • nitrogen dioxide
  • oxygen

Each gas can be used once, more than once or not at all.

Name a gas which

(a) is made during the incomplete combustion of octane,
[1] (b) dissolves in water to make an alkaline solution,[1] (c) is monatomic,
[1] (d) is a reducing agent in a Blast Furnace,
[1] (e) is used in the Contact process.
[1]

Solution 2

(a) Carbon monoxide
All substances that contain carbon produces carbon monoxide during incomplete combustion because in limited oxygen, carbon is partially oxidised to carbon monoxide. If it was complete combustion, carbon dioxide would be produced.

(b) Ammonia
Only soluble bases form alkaline solutions and ammonia is the only known gaseous base. An alkaline substance is a substance that releases OH ions in solution and is the opposite of an acid, which produces H+ ions in solution.

(c) Argon
Argon, and all other noble gases are monoatomic because their atoms do not combine with each other since they have full outer shells. An monoatomic gas is the opposite of a diatomic gas. Atoms of a diatomic gas exists in covalently bonded pairs called molecules.

(d) Carbon monoxide
Since the carbon in carbon monoxide is not fully oxidised, carbon monoxide has an affinity for oxygen. It is therefore a reducing agent, hence its use in reducing iron (iii) oxide in the blast furnace.

(e) Oxygen
Oxygen is used in the contact proccess to oxidise sulphur dioxide to sulphur trioxide.



Question 3

Choose from the following oxides to answer the questions below.

  • aluminium oxide
  • calcium oxide
  • carbon monoxide
  • copper(II) oxide
  • sulphur dioxide
  • sulphur trioxide
  • vanadium(V) oxide

Each oxide can be used once, more than once or not at all.

Name an oxide which
(a) is used as a catalyst in the Contact process,
[1] (b) is formed during the incomplete combustion of propane,[1] (c) reacts with dilute sulphuric acid to give a blue solution,
[1] (d) reacts with water to give sulphurous acid,
[1] (e) when heated in a Blast Furnace with sand makes slag.
[1]

Solution 3

(a) vanadium(V) oxide
(b) carbon monoxide
(c) copper(ii) oxide
(d) sulphur dioxide
(e) calcium oxide



Question 4

Choose from the following elements to answer the questions below.

  • aluminium
  • argon
  • iron
  • nickel
  • nitrogen
  • phosphorus
  • sodium

Each element can be used once, more than once or not at all.

Name an element which
(a) is used as a catalyst in the hydrogenation of alkenes,
[1] (b) is manufactured by electrolysis,
[1] (c) reacts with oxygen to give an acidic oxide,
[1]

Solution 4

(a) nickel
(b) aluminium
(c) phosphorus



Question 5

Choose from the following substances to answer the questions below.

  • aluminium oxide
  • ammonia
  • barium sulphate
  • calcium carbonate
  • carbon monoxide
  • lead(II) iodide
  • nitrogen dioxide
  • silicon dioxide

Each substance can be used once, more than once or not at all.

Name a substance which

(a) is a gas that causes acid rain,
[1] (b) has a giant molecular structure,
[1] (c) is amphoteric,
[1]

Solution 5

(a) nitrogen dioxide
(b) silicon dioxide
(c) aluminium oxide



Question 6

Choose from the following substances to answer the questions below.

  • argon
  • calcium phosphate
  • ethene
  • lead(II) nitrate
  • methane
  • phosphorus oxide
  • potassium nitrate
  • sulphur dioxide

Each substance can be used once, more than once, or not at all.

Name a substance which
(a) is a greenhouse gas produced by the decay of vegetable matter.[1] (b) contains two of the essential elements needed by plants,
[1] (c) dissolves in water to form a solution which neutralises sodium hydroxide.
[1]

Solution 6

(a) Methane
(b) Potassium nitrate
(c) phosphorus oxide



Question 7

Choose from the following elements to answer the questions below.

  • argon
  • bromine
  • carbon
  • hydrogen
  • iodine
  • iron
  • neon
  • sulphur

Each element can be use used once, more than once, or not at all.

Name an element which

(a) forms a basic oxide,[1] (b) is a liquid at room temperature and pressure,[1] (c) reacts with aqueous copper(II) sulphate to give a pink solid[1] (d) is formed during the electrolysis of concentrated aqueous sodium chloride,[1]

Solution 7

(a) iron
(b) bromine
(c) iron
(d) hydrogen



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