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Solution


Q.

Which of these graphs shows how the pH of milk changes as it forms curd
1 a  
2 b  
3 c  
4 d  

Ans.

(1)

Fresh milk has an acidic character due to its pH of 6.4 to 6.8. By the action of bacteria, this milk is transformed into curd, which further increases the curd's acidity and lowers its pH from 6 to less than 6.