In which of the following reactions is Delta | vedclass

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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system. $\Delta S$ is positive when the disorder of the system increases.$1$. $H_2O(

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$H_2O(\ell) \rightarrow H_2O_{(g)}$

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(B) Entropy $(S)$ is a measure of the randomness or disorder of a system. $\Delta S$ is positive when the disorder of the system increases.$1$. $H_2O(\ell) \rightarrow H_2O_{(s)}$: Liquid to solid represents a decrease in disorder,so $\Delta S $2$. $H_2O(\ell) \rightarrow H_2O_{(g)}$: Liquid to gas represents a significant increase in disorder,so $\Delta S > 0$.$3$. $N_2(g, 1 \ atm) \rightarrow N_2(g, 10 \ atm)$: Increasing pressure at constant temperature decreases the volume available to gas molecules,decreasing disorder,so $\Delta S $4$. $Fe_{(s)}, 400 \ K \rightarrow Fe_{(s)}, 300 \ K$: Decreasing temperature decreases the kinetic energy and vibrational motion of atoms in the solid,decreasing disorder,so $\Delta S Therefore,the correct option is $B$.

$a$. Liquid to vapor conversion	$1$. $\Delta S = 0$
$b$. Reaction not spontaneous at any temperature,$\Delta H = (+)$	$2$. $\Delta S = (+)$
$c$. Reversible expansion of an ideal gas	$3$. $\Delta S = (-)$

In which of the following reactions is $\Delta S$ positive?

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