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Question

For the reaction : Cl2(g)2Cl(g), _________
  1. Δ H is positive, Δ S is positive
  2. Δ H is positive, Δ S is negative
  3. Δ H is negative, Δ S is positive
  4. Δ H is negative, Δ S is negative

A
Δ H is negative, Δ S is negative
B
Δ H is positive, Δ S is positive
C
Δ H is positive, Δ S is negative
D
Δ H is negative, Δ S is positive
Solution
Verified by Toppr

ΔH and ΔS are negative.

The given reaction represents the formation of chlorine molecule from chlorine atoms.

Here, the bond formation is taking place. Therefore, energy is being released. Hence, ∆H is negative.

Also, two moles of atoms have more randomness than one mole of a molecule. Since spontaneity is decreased, ∆S is negative for the given reaction.

Hence option C is the correct answer.

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