Mohr's salt is a

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

The hydrolysis constant $(K_h)$ for a salt of a weak acid and a weak base is given by:

Which among the following is an example of a salt of a weak acid and a strong base?

Which of the following compounds give a basic solution on hydrolysis?
$(1)$ $NH_4Cl$
$(2)$ $K_2CO_3$
$(3)$ $Na_2B_4O_7 \cdot 10 H_2O$
$(4)$ $NaCl$

Which of the following aqueous salt solutions has the least $pH$ value?