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For the reaction, 2Cl(g) → Cl2(g), the correct option is:

1. ΔH > 0 and ΔS < 0
2. ΔH < 0 and ΔS > 0
3. ΔH < 0 and ΔS < 0
4. ΔH > 0 and ΔS > 0

Correct answer: ΔH < 0 and ΔS < 0

Solution

The reaction involves the formation of a Cl2 molecule from two Cl atoms, which releases energy (ΔH < 0) and decreases randomness (ΔS < 0) as two particles combine into one.

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