Hydrogen preparation and properties — KCSE Chemistry

KCSE Chemistry · 62 practice questions · 4 syllabus objectives

26 easy25 medium11 hard

What You'll Learn

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

Describe the laboratory preparation of hydrogen from the reaction of zinc with dilute sulphuric acid

State the physical and chemical properties of hydrogen including its reaction with copper(II) oxide

Describe the test for hydrogen and state its industrial uses

Hydrogen preparation and properties

Sample Questions

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1
easySHORT ANSWER3 marks

Define the test for hydrogen gas and give two industrial uses of hydrogen. (3 marks)

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Part (a) — 1 mark
A glowing splint will produce a 'pop' sound when hydrogen is present (1 mk)
Part (b) — 2 marks
Used in the production of ammonia through the Haber process (1 mk)
Used as a fuel in hydrogen fuel cells (1 mk)
2
easySHORT ANSWER4 marks

State the products formed when hydrogen reacts with copper(II) oxide and explain the significance of this reaction in metallurgy. (4 marks)

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Part (a) — 2 marks
Copper is formed as a solid (1 mk)
Water (steam) is produced as a gas (1 mk)
Part (b) — 2 marks
The reaction reduces copper(II) oxide to copper, allowing for metal extraction (1 mk)
It provides a method to purify copper from its ores (1 mk)
3
easySHORT ANSWER2 marks

Identify two physical properties of hydrogen gas that make it suitable for use in balloons. (2 marks)

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Part (a) — 2 marks
Hydrogen is lighter than air, providing lift (1 mk)
Hydrogen is non-toxic and does not pose health risks (1 mk)
4

List two observations that can be made during the reaction of zinc with dilute sulphuric acid in the laboratory preparation of hydrogen. (2 marks)

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