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The increasing order of boiling point of hydrides of group 15 elements is
A. |
`PH_3 < AsH_3 < NH_3 <SbH_3` |
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B. |
`PHÂ_3 <AsH_4 <SbH_2<NH_3` |
C. |
`NH_3 <PH_3 <AsH_3 <SbH_3` |
D. |
`AsH_3 < PH_3 < NH_3 < SbH_3` |