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(a) Fresh milk has a pH of 6. When it ch...

(a) Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease ? Why ?
(b) Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised ?
(c) On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Predict the new compound formed which imparts a blue-green colour to the solution.

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