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We know that, Cl2(g) → 2Cl(g) is endothermic reaction because it required energy to break bond.

1. (a) Cl2(g) → 2Cl(g) is endothermic
2. (b) Cl2(g) → 2Cl(g) is exothermic
3. (c) Cl2(g) → 2Cl(g) requires energy
4. (d) Cl2(g) → 2Cl(g) releases energy

Correct answer: (a) Cl2(g) → 2Cl(g) is endothermic

Solution

The dissociation of Cl2 into two Cl atoms involves breaking a covalent bond, which requires energy input, making the reaction endothermic.

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