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Q.

For which reaction, change of entropy will be positive

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a

$H_{2 (g)} + I_{2 (g)} ⇌ 2 {HI}_{(g)}$

b

${HCl}_{(g)} + {NH}_{3 (g)} ⇌ {NH}_{4} {Cl}_{(s)}$

c

${NH}_{4} {NO}_{3 (s)} ⇄ N_{2} O_{(g)} + 2 H_{2} O_{(g)}$

d

${MgO}_{(s)} + H_{2 (g)} ⇌ {Mg}_{(s)} + H_{2} O_{(l)}$

answer is C.

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Detailed Solution

Entropy is a measure of randomness of the system, so entropy of a substance in different physical states is in the order:
Gas > liquid > solid
ΔS = S_product−S_reactant
In third option, solid is converted into a gaseous state, so ΔS will be positive.

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For which reaction, change of entropy will be positive