Question

how does the thermal stability of hydrides of group 15 elements vary?​

Answer 1

The stability of hydrides decreases from ammonia to bismuthine. This is because the central atom E increases in size down the group. With the increase in the size of the central atom, the E – H bond becomes weaker. where E is nitrogen ,phosphorus, arsenic,antimony , bismuth.

Answer 2

The thermal stability of hydrides of group 15 elements vary as it decreases with increase in size of the central atom.

Explanation:

• Stability of the hydrides of group 15 decreases when we move down a group. This is because smaller is the size of central metal atom more stronger will be the overlapping taking place with the hydrogen atom.

• For example, hydride of nitrogen is $NH_{3}$ and as nitrogen is the smallest element of group 15 so, there occurs effective overlapping between the nitrogen and hydrogen atom.

• Hence, to break the bond between hydrogen and nitrogen atom we need to supply large amount of heat. Therefore, its thermal stability will be high.

• Whereas bismuth is the largest element of group 15 and its hydride is $BiH_{3}$. As larger bismuth is not able to overlap effectively hence, B-H bond will easily break down through the supply of smaller amount of heat.

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