Daily Chemistry Problems for JEE - Day 3

Equal volumes of following solutions are mixed, in which case will the pH of resulting solution be average value of pH of the two solutions ?

1. pH $=3(HNO_3)$ and pH $=5(HNO_3)$

2. pH $=2(HNO_3)$ and pH $=12(KOH)$

3. pH $=4.5(CH_3COOH)$ and pH $=9.5(NH_3)$ , Given: $K_a(CH_3COOH)=K_b(NH_4OH)$

4. pH $=3(HCN)$ and pH $=11(NaOH)$ , Given: $K_a(HCN)=10^{-10}$

Details: There can be multiple correct answers. If your answer is choice 1,2 and 3 then type your answer as 123 (choices must be in ascending order).

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