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Does the pH increase, decrease, or remain the same on addition of each of the following?...

Does the pH increase, decrease, or remain the same on addition of each of the following? (i) NaNO2 to a solution of HNO2, (ii) HCl to a solution of NaC2H3O2

A. (i) decrease, (ii) increase

B. (i) increase, (ii) increase

C. (i) decrease, (ii) decrease

D. (i) increase, (ii) decrease

Pls explain the answers for me.

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