Which salt from following forms aqueous solution having $$\mathrm{pH}$$ less than 7 ?

Solubility of a salt $$\mathrm{A}_2 \mathrm{~B}_3$$ is $$1 \times 10^{-3} \mathrm{~mol} \mathrm{~dm}^{-3}$$. What is the value of its solubility product?

Which of the following aqueous solutions of salts will have highest $$\mathrm{pH}$$ value?

What is the $$\mathrm{pH}$$ of $$2 \times 10^{-3} \mathrm{M}$$ solution of monoacidic weak base if it ionises to the extent of $$5\%$$ ?