Explanation

(a)
Relationship between normality and molar concentration is
Normality = n $\times$ molarity (M)
Where, n = the number of moles of $\ H^{+}$ per mole of the compound that solute is capable of releasing [acid] on reacting with base.
In case of HCl,
n = 1
Hence, 2 N HCl solution $\approx$ 2 M $H_{2}{SO}_{4}$ solution.
In case of $H_{2}{SO}_{4}$
n= 2
Hence, 4.0$\ NH_{2}{SO}_{4}$ solution $\approx$ 2 M$H_{2}{SO}_{4}$ solution.