Nitrogen and its compounds — KCSE Chemistry

KCSE Chemistry · 58 practice questions · 4 syllabus objectives

17 easy21 medium20 hard

What You'll Learn

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

Describe the nitrogen cycle and explain the role of microorganisms in nitrogen fixation and denitrification

Describe the industrial manufacture of ammonia by the Haber process including conditions (450°C, 200 atm, Fe catalyst)

State the properties of ammonia and write equations for its reactions with acids to form ammonium salts

Nitrogen and its compounds

Sample Questions

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easySHORT ANSWER2 marks

State the equation for the reaction of ammonia with nitric acid to form ammonium nitrate. (2 marks)

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Part (a) — 2 marks

NH₃(g) + HNO₃(aq) → NH₄NO₃(aq) (2 mks)

easySHORT ANSWER2 marks

State two physical properties of ammonia that make it suitable for use in refrigeration systems. (2 marks)

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Part (a) — 2 marks

Ammonia has a low boiling point (-33°C) which allows it to vaporise easily at low temperatures (1 mk)

Ammonia has a high latent heat of vaporisation, making it effective for heat absorption during the refrigeration cycle (1 mk)

easySHORT ANSWER4 marks

Identify the specific conditions required for the Haber process, including optimum temperature, optimum pressure, and the catalyst used. (4 marks)

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Part (a) — 1 mark

Temperature: 450°C (1 mk)

Part (b) — 1 mark

Pressure: 200 atmospheres (1 mk)

Part (c) — 2 marks

Catalyst: finely divided iron (1 mk)

Optional: Aluminium oxide is often used as a promoter (1 mk)

Identify the main raw materials used in the Haber process for ammonia synthesis and state their sources. (4 marks)

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Why Practise Nitrogen and its compounds?

KNEC Aligned

Questions match the KCSE syllabus objectives and exam format exactly.

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Nitrogen and its compounds — KCSE Chemistry

What You'll Learn

Sample Questions

+55 More Questions

Why Practise Nitrogen and its compounds?

KNEC Aligned

Detailed Marking Schemes

Track Your Mastery

Master Nitrogen and its compounds for KCSE