See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

(A) NH3 has higher boiling point than AsH3 and PH3 on account H-bonding. SbH3 has highest boiling point on account of highest molecular weight. (B) As the size of element increases, the strength of M-H bond decreases and thus stability decreases. (C) Basicity decreases down the group. (Drago rule). (D) (Drago rule). HEH angle  3 3 3 3 : NH 107.8;PH