See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(i) 3 2 4 4 PO H HPO m.mol. 10 5 0 after neutralization 5 0 5      So, 3 a pH pK 13   (Buffer) (ii) 3 2 4 4 PO H HPO m.mol. 10 10 0 after neutralization 0 0 10      So, 8 13 pH