First slide

2nd Law of Thermodynaimcs

Question

In which of the following process, increase in Entropy is observed

Moderate

A

Formation of $NO$ from $N_{2} {and O}_{2}$
B

Formation of ${CaCO}_{3}$ from $CaO and$ ${CO}_{2}$
C

Formation of ${NO}_{2} from$ $NO and O_{2}$
D

Formation of $CO from ‘ C ’ and O_{2}$

Solution

$C (s) + \frac{1}{2} O_{2} (g) \overset{}{\to} CO (g)$
No. of moles of gases increased. Randomness increases
$n_{R} = 0 .5$
$n_{P} = 1$

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