Answer:
(a) \[q+w=\Delta U\]. As \[\Delta U\] is a state function, hence \[q+w\] is a state function.
(b) On dissolution, entropy increases, i.e., \[\Delta S\] is +ve. Though \[\Delta H\] is +ve but if \[T\Delta S>\Delta H,\] then according to the equation, \[\Delta G=\Delta H-T\Delta S,\,\Delta G\]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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