MCQ
Which of the following molecule has net dipole moment zero?
- AHF
- BH2O
- CBF3
- DCHCl3
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The mass (in $\mathrm{mg}$ ) of $\mathrm{S}$ obtained is. . . . . . . [Use molar mass (in g mol ${ }^{-1}$ ) : $\mathrm{H}=1, \mathrm{C}=12, \mathrm{~N}=14, \mathrm{Br}=80$ ]
$(a)$ $O_2^ - ,{O_2}$ $(b)$ ${N_2},N_2^ +$ $(c)$ $NO^+, NO^-$