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Q.

Which of the following reaction is spontaneous at room temperature.

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a

$I_{2} + H_{2} O \to HI + HIO$

b

$2 H_{2} + O_{2} \overset{Pt}{⟶} 2 H_{2} O$

c

$N_{2} + O_{2} \to 2 NO$

d

$2 HCl \to H_{2} + {Cl}_{2}$

answer is B.

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Detailed Solution

Spontaneous reactions are those reactions which can occur without any external factors at room temperature.
Reaction (A) is a non-spontaneous reaction because when $I_{2}$ and $H_{2} O$ are mixed then reaction doesn’t occur.
Reaction (B) is a spontaneous reaction because it can occur at room temperature without any external factors.
Reaction (C) is a non-spontaneous reaction because it can only occur in high temperature.
Reaction (D) is a non-spontaneous reaction because $HCl$ is a stable compound and it doesn’t dissociate easily.

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Which of the following reaction is spontaneous at room temperature.