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The correct sequence which shows the increasing basic strength is

$\begin{array}{1 1}(a) NH_3 < PH_3 < AsH_3 < BiH_3\\(b)\; NH_3 < PH_3 < BiH_3 < AsH_3\\(c)\; AsH_3 < BiH_3 < PH_3 < NH_3\\(d) \;AsH_3 < PH_3 < BiH_3 < NH_3\end{array}$

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As the bond length between the metal and hydrogen increases, Its basic strength also increases.
Hence (a) is the correct answer.
answered Dec 9, 2013 by sreemathi.v

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