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Give reasons : (a) Neither q nor w is ...

Give reasons `:` (a) Neither q nor w is a state function but`q+w` is a state function.
(b) The dissociation of ammonium chloride in water is endothermic still it dissolved in water.
(c ) A real crystal has more entropy than an ideal crystal.

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(a) `q+w = DeltaU` . As `DeltaU` is a state function,hence`q+w` is a state function.
(b) On dissolution,entropy increases , i.e.,`DeltaS` is`+ve` . Though `DeltaH` is`+ve` but if `T DeltaS gt DeltaH ` , then according to the equation ,`DeltaG = DeltaH -T DeltaS , DeltaG` will be -ve. Hence,the process is spontaneous.
(c ) A real crystal has some disorder due to presence of defects whereas ideal crystal has no disorder. Hence, a real crystal has more entropy than ideal crystal.
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