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A: Thermal stability of the hydrides of VIA group elements decreases from H₂O to H₂Po.
R: The heats of dissociation of M-H bond of hydrides of VIA group decreases down the group.
The correct answer is

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Both (A) and (R) are true ( R) is the correct explanation of (A)

Both (A) and ( R) are true and ( R) is not the correct explanation of (A)

(A) is true but ( R) is false

(A) is false but ( R) is true

answer is A.

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Detailed Solution

As we move down the group, the bond strength of group 15 hydrides decreases due to an increase in the size of atoms. So, as the bond strength decreases, the ease to produce increase along with the group.

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