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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. $2NaHCO_{3(s)} \rightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}$
D. $Cl_{2(g)} \rightarrow 2Cl_{(g)}$
Choose the correct answer from the options given below:
A
A, C and D
B
C and D
C
A and C
D
A, B and D
Detailed Solution
Entropy increases with increase in disorder (randomness) of the system.
A. A liquid evaporates to vapour – randomness increases, entropy increases.
B. Temperature of a crystalline solid lowered from 130 K to 0 K – randomness decreases, entropy decreases.
C. $2NaHCO_3(s) \rightarrow Na_2CO_3(s) + CO_2(g) + H_2O(g)$ – solid gives gases, entropy increases.
D. $Cl_2(g) \rightarrow 2Cl(g)$ – molecule converts into atoms, entropy increases.
So entropy increases in A, C and D.