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Solution


Q.

In which of the following, the identity of initial substance remains unchanged
1 Curdling of milk  
2 Formation of crystals by process of crystallisation  
3 Fermentation of grapes  
4 Digestion of food  

Ans.

(2)

Formation of crystals by process of crystallisation is the reaction in which the original identity of the substance remains as such, since on heating the crystals they can again be converted in the powder form and again on cooling they can recrystallise.