WAEC Chemistry 2023 Objective — Question 3

Question 3 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

Thermal cracking of alkanes usually

A. involves decompositionCorrect
B. is an exothermic process
C. produces only small alkanes
D. requires hydrogen

Explanation

In thermal cracking, high temperatures (usually 450–750°C) and pressures (up to about 70 atmospheres) are used to break large hydrocarbons into smaller ones — this is a decomposition process.

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