Sulphur and its compounds — KCSE Chemistry

KCSE Chemistry · 47 practice questions · 4 syllabus objectives

13 easy16 medium18 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the allotropes of sulphur (rhombic and monoclinic) and state their differences

Describe the industrial manufacture of sulphuric acid by the Contact process including conditions and equations

State the properties and uses of sulphur dioxide and sulphuric acid and explain their environmental impact

Sulphur and its compounds

Sample Questions

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easySHORT ANSWER3 marks

State two properties of sulphur dioxide and explain its environmental impact. (3 marks)

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Part (a) — 2 marks

Colourless gas with a pungent smell (1 mk)

Soluble in water, forming sulphurous acid (1 mk)

Part (b) — 1 mark

Contributes to acid rain, which can harm aquatic life and damage vegetation (1 mk)

easySHORT ANSWER4 marks

List the main stages of the Contact process for the production of sulphuric acid, including the conditions used at each stage. (4 marks)

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Part (a) — 4 marks

Stage 1: Conversion of sulphur dioxide (SO₂) to sulphur trioxide (SO₃) at about 450°C and 2 atmospheres pressure (1 mk)

Stage 2: Absorption of SO₃ in concentrated sulphuric acid to form oleum at ambient temperature (1 mk)

Stage 3: Dilution of oleum with water to form sulphuric acid at ambient temperature (1 mk)

Overall reaction: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = -197 kJ/mol (exothermic) (1 mk)

easySHORT ANSWER4 marks

Explain the significance of sulphur in agriculture. (4 marks)

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Part (a) — 4 marks

Sulphur is an essential nutrient for plant growth (1 mk)

It is a component of amino acids and proteins (1 mk)

Sulphur is used in the production of fertilizers (1 mk)

Helps in the synthesis of chlorophyll (1 mk)

Name two compounds formed when sulphur reacts with oxygen. (2 marks)

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Why Practise Sulphur and its compounds?

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Sulphur and its compounds — KCSE Chemistry

What You'll Learn

Sample Questions

+44 More Questions

Why Practise Sulphur and its compounds?

KNEC Aligned

Detailed Marking Schemes

Track Your Mastery

Master Sulphur and its compounds for KCSE