Which among the following salts forms basic solution when dissolved in water?

Identify the product formed when 2-Bromobutane is heated with aqueous solution of sodium hydroxide.

What is the charge required to convert $2 \mathrm{~mol} \mathrm{KMnO}_4$ to $\mathrm{MnSO}_4$ ?

Find the volume of 56 g dinitrogen at STP