MCQ
Which one of the following species has triangular planar shape ?
- A$N_3^-$
- ✓$NO_3^-$
- C$NO_2^-$
- D$CO_2$

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(Molar mass of $Fe =56\, g\, mol ^{-1}$ )
$C{H_3} - C \equiv CH\xrightarrow[{(ii)\,\,NaB{H_4}}]{{(i)\,\,Hg{{(OAC)}_2}/{H_2}O}}\,(Q)$
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Statement $I$ : Gallium is used in the manufacturing of thermometers.
Statement $II$ : A thermometer containing gallium is useful for measuring the freezing point ( $256 \mathrm{~K}$ ) of brine solution.
In the light of the above statement, choose the correct answer from the options given below :