Regarding the hydrides of 15th group hydrides, Improper trend of the following is

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NH3< PH3

NH3> PH3>AsH3> SbH3..… PKa

NH3< PH3

NH3> SbH3>AsH3> PH3…..Melting point

answer is C.

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Detailed Solution

Down the group in 15th group hydrides, X - H bond enthalpy decreases. Due to this A)Acidic strength increases, pka decreases.B) Reducing power increases.Due to inter molecular hydrogen bonding, ammonia has higher melting and boiling points than expected. NH3>SbH3>AsH3 >PH3......MP SbH3>NH3 >AsH3 >PH3.......BPIn the hydrides of 15th group, basicity(basic strength) decreases down the group.All hydrides contain a lone pair on central atom.Down the group as the size of central atom increases, electron density on central atom decreases, basic strength decreases.

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