Assertion : Reducing nature of pnicogen hydri | vedclass

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Question

(D) As we move down the group $15$ (pnicogens),the atomic size of the central atom increases.This leads to an increase in the bond length $(B.L.)$ and

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Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Vedclass · Answer

(D) As we move down the group $15$ (pnicogens),the atomic size of the central atom increases.This leads to an increase in the bond length $(B.L.)$ and a decrease in the bond strength $(B.S.)$ of the $E-H$ bond.Due to the decrease in bond strength,the thermal stability $(T.S.)$ of the hydrides decreases down the group.Because the $E-H$ bond becomes weaker,the tendency to release hydrogen increases,which makes the hydrides stronger reducing agents.Therefore,the reducing nature of pnicogen hydrides increases down the group because their thermal stability decreases.Both Assertion and Reason are true,and the Reason is the correct explanation of the Assertion.

Assertion $:$ Reducing nature of pnicogen hydrides increases on moving down the group.
Reason $:$ Thermal stability of pnicogen hydrides decreases on moving down the group.

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Assertion $:$ Reducing nature of pnicogen hydrides increases on moving down the group.Reason $:$ Thermal stability of pnicogen hydrides decreases on moving down the group.