To prepare a buffer of $pH$ 8.26 amount of $(NH_4)_2SO_4$ to be added into 50 mL of 0.01 M $NH_4OH$ solution is [$pK_a (NH_4^+)$ = 9.26]

Question

(a) 0.05 mol

(b) 0.025 mol

(c) 0.10 mol

(d) 0.005 mol