$pH$ of $10^{-3} \ M$ $NaCl$ solution at $25 \ ^oC$ is

Aqueous solutions of $1 \ M$ potassium acetate and $1 \ M$ potassium formate are taken in separate beakers. Which of the following relationships is correct?

Which of the following salts does not undergo hydrolysis?

How many hydroxide ions are produced by the hydrolysis of one mole of sodium carbonate $(Na_2CO_3)$?

Which one of the following substances will be a mixed salt?

The aqueous solution of $CH_3COONa$ is .......