Some trends of 15^th group hydrides are given below. The incorrect trend among these is

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PH₃ > AsH₃ > NH₃ > SbH₃ . . . Volatile character

NH₃ > PH₃ > AsH₃ > SbH₃ . . . Bond angle

SbH₃ > AsH₃ > PH₃ > NH₃ . . . Thermal stability

SbH₃ > AsH₃ > PH₃ > NH₃ . . . Reducing power

answer is A.

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Detailed Solution

NH₃> PH₃ > AsH₃ > SbH₃ is the correct order of thermal stability.

Ammonia has H-bonding and as the atomic size of group-15 elements increases, the bond with hydrogen decreases which reduces the thermal stability of hydrides of group-15 elements.

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