Which of the following is an exothermic compound?
A. `SbH_(3)`
B. `AsH_(3)`
C. `PH_(3)`
D. `NH_(3)`
A. `SbH_(3)`
B. `AsH_(3)`
C. `PH_(3)`
D. `NH_(3)`
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Correct Answer – 4
The thermal stability of the hydrides decreases as we move from `NH_(3)` to `BiH_(3)` on account of the decrease of `E-H` bond strength.
Only `NH_(3)` has negative `Delta_(f)H^(Ɵ)` whilst all other hydrides have positive `Delta_(f)H^(Ɵ)`