Most non-volatile hydrides of 16th group and 15th group respectively are
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a
H2O , NH3
b
H2O , BiH3
c
H2O , PH3
d
H2S , PH3
answer is B.
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Detailed Solution
Down the group in hydrides of 16th & 15th groupVanderwaal's forces become stronger , B.P must increaseBut NH3 of 15th group & H2O of 16th group involve in intermolecular H-bondingThey have abnormal B.Ps