Q.

One of the following reactions involves in decrease of entropy

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a

Burning of rocket fuel

b

Sublimation of dry ice

c

Decomposition of gaseous N2O4.

d

Crystallisation of salt from brine (aq)

answer is B.

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Detailed Solution

In aqueous solution of brine NaCl ionises to form free ions and Entropy is more. When it is crystallised solid NaCl is formed in which free movement of ions is restricted due to electrostatic force of attractions and entropy decreases.

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