In which of the following processes entropy increases? A. A liquid...

In which of the following processes entropy increases? A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from 130 K to 0 K . C.

2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}

\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}

Choose the correct answer from the options given below:

Options

AA, B and D
BA, C and D
CC and D
DA and C

Correct answer

B. A, C and D

Step-by-step solution

When a liquid evaporates to vapour entropy increases

2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}

Number of gaseous product molecules increases so entropy increases.

\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}

1 mole

\mathrm{Cl}_{2(\mathrm{~g})}

form

2 \mathrm{~mol} \mathrm{Cl}_{(\mathrm{g})}

. So entropy increases.

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