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The process with negative entropy change...

The process with negative entropy change is

A

Synthesis of ammonia from `N_(2)` and `H_(2)`

B

Dissociation of `CaSO_(4)` (s) to CaO(s) and `SO_(3)`(g)

C

Subimation of dry ice

D

Dissolution of iodine in water

Text Solution

Verified by Experts

The correct Answer is:
A
(A) `N_(2) + 3H_(2) to 2NH_(3)`
Since, number of gaseous moles are decreasing hence entropy `DeltaS =S_("products")-S_("reactants")` is negative
(B) `underset(s)(CaSO_(4)) to underset(B)(CaO) + underset(g)(SO_(3))`
`DeltaS`: positive, as number of gas moles increases
( C) `CO_(2) (s) to CO_(2)(g)`
`DeltaS`: positive as number of gaseous moles are increasing
( D) `I_(2)(g) to I_(2)(aq)`
`DeltaS`: positive as randomness of the system has increased
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