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Which of the following arrangements correctly represent a decreasing order of bond angles?

$\begin{array}{1 1}(a)\;NH_3 > PH_3 > AsH_3\\ (b)\;NH_3 > H_2O > F_2O \\(c)\;CH_4 > NH_3 > H_2O\\(d)\;\text{None of these}\end{array} $

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Due to the increasing size and decreasing electronegativity of the central atom,the bonding electrons are drawn out further,thus repulsion between bonding pairs of electrons decreased.
Hence (a) $NH_3 > PH_3 > AsH_3$ is the correct answer.
answered Mar 26, 2014 by sreemathi.v

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