WAEC Chemistry 2025 Theory — Question 56

Question 56 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

5(b)(iii). Explain briefly why the temperature in the blast furnace decreases from bottom to top.

Model answer

This is because the reaction that occurs in the lower part of the furnace is exothermic (releasing heat), while the reaction that occurs in the upper part is endothermic (absorbing heat).

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