p-Block elementsHard

Question

The thermal stability of the hydrides of group 15 follows the order :

Options

A.NH3 < PH3 < AsH3 < SbH3 < BiH3
B.NH3 > PH3 > AsH3 > SbH3 > BiH3
C.PH3 > NH3 > AsH3 > SbH3 < BiH3
D.AsH3 < PH3 > SbH3 > BiH3 > NH3

Solution

Down the group the X-H bond length increases with increase in size of atom. So bond dissociation energies decrease and thererfore, thermal stability decrease. Hence the correct decreasing order is NH3 > PH3 > AsH3 > SbH3 > BiH3.

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