Which Of the following orders is correct? (1) S b H 3 N H 3 A s H 3 P H 3 - Boiling Point (2) N H 3 P H 3 A s H 3 S b H 3 - Thermal Stability (3) N H 3 P H 3 A s H 3 S b H 3 - Basic Character (4) N H 3 P H 3 A s H 3

Question

Which Of the following orders is correct? (1) S b H 3 > N H 3 > A s H 3 > P H 3 - Boiling Point (2) N H 3 > P H 3 > A s H 3 > S b H 3 - Thermal Stability (3) N H 3 > P H 3 > A s H 3 > S b H 3 - Basic Character (4) N H 3 > P H 3 > A s H 3 > S b H 3 - Bond Angle

Quantrex Academy · Accepted Answer

Correct answer: C. (1), (3) and (4) only

(1) N H 3 has higher boiling point than As H 3 and P H 3 on account H ‐bonding. Sb H 3 has highest boiling point on account of highest molecular weight. (2) As the size of element increases, the strength of M‐H bond decreases and thus stability decreases. (3) Basicity decreases down the group. (Drago rule). (4) HEH angle ( ∘ ) : N H 3 = 107.8 ; P H 3 = 93.6 , As H 3 = 91.8 ; Sb H 3 = 91.3 .

Which Of the following orders is correct? (1) S b H 3 > N H 3 > A s H 3 > P H 3 - Boiling Point (2) N H 3 > P H 3 > A s H 3 > S b H 3 - Thermal Stability (3) N H 3 > P H 3 > A s H 3 > S b H 3 - Basic Character (4) N H 3 > P H 3 > A s H 3 > S b H 3 - Bond Angle

Options

Correct answer

Step-by-step solution

More from p Block Elements (Group 15, 16, 17 & 18)