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Q.

For the reaction $I_{2 (g)} ⇌ I_{2 (s)}; ΔH = - ve$ Then
choose the correct statement/s from the following.
a) The process is spontaneous at all temperatures
b) The process is accompained by an increase entropy
c) The process is accompained by a decrease in entropy
d) The process is accompained by a decrease in enthalpy
The correct statements are

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a

Only b and d

b

Only a, b and c

c

Only a, c and d

d

Only c and d

answer is C.

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Detailed Solution

I_2(g) is converted into I_2(s). Entropy decreases.

$∆ H = - ve$ ; enthalpy decreases

$∆ S$ decreases and $∆ H$ is also decreasing, it is spontaneous if $∆ H$ > $T ∆ S$ . This is possible only at low temperatures.

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For the reaction I2(g)⇌I2(s);ΔH=−veThenchoose the correct statement/s from the following.a) The process is spontaneous at all temperaturesb) The process is accompained by an increase entropyc) The process is accompained by a decrease in entropyd) The process is accompained by a decrease in enthalpyThe correct statements are