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Class 10 · Science · Science

1. Chemical Reactions and Equations

Chapter test

Practise 5 questions from this chapter

Timed, with answers, explanations and where your marks went.

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Try question 1

Rusting of iron is an example of

Answer and explanation

Answer: B. oxidation

Iron combines with oxygen (in the presence of moisture) — that is oxidation.

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Try question 2

The reaction CaO + H₂O → Ca(OH)₂ is a

Answer and explanation

Answer: C. combination reaction

Two reactants combine to form a single product.

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Try question 3

A reaction in which heat is given out is called

Answer and explanation

Answer: B. exothermic

Exothermic reactions release heat, e.g. burning of natural gas or respiration.

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All 5 questions of this chapter, with explanations →