Which of the following hydrides has the highest M-H bond polarity

(a) AsH3           (b) BiH3            (c) SbH3          (d) None of these

Joshi sir comment

electronegativity of H = 2

and for all other elements in this question electronegativity is less than 2 

least for Bi 

so diff. for Bi is max so max polar

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