1.

Solubility curve of Na_(2)SO_(4).10H_(2)O in water with temperature is given as

Answer»

SOLUTION process is EXOTHERMIC
Solution process is exothermic till `32.4^(@)C` and endothermic after `32.4^(@)C`
Solution process is endothermic till `32.4^(@)` and exothermic thereafter
Solution process is endothermic

Solution :Below `34^(@)C, Na_(2)SO_(4).10H_(2)O` exists as such, since in this part solubility increases. This IMPLIES that process must be endothermic. Thereafter, solubility DECREASE with rise in temperature. It means that the solution process is exothermic. In fact after `34^(@)C` the substance exists in anhydrous state `Na_(2)SO_(4)`.


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