O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2021 · Q171 Mark

The reaction of hydrogen with chlorine to form gaseous hydrogen chloride is exothermic. Which statement is correct?

AThe total energy of bond formation is greater than the total energy of bond breaking.

BThe total energy of bond breaking is greater than the total energy of bond formation.

CThe temperature of the reaction mixture falls during the reaction.

DThe temperature of the reaction mixture remains unchanged during the reaction.

✓ Correct answer

A: The total energy of bond formation is greater than the total energy of bond breaking.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 1, question 17.

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