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