MCQ
Triple bond in ethyne is formed from
- AThree sigma bonds
- BThree pi bonds
- ✓One sigma and two pi bonds
- DTwo sigma and one pi bond

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The $y$ and $x$ axes for zero and first order reactions, respectively are
$A$. The chromate ion is square planar.
$B$. Dichromates are generally prepared from chromates.
$C$. The green manganate ion is diamagnetic.
$D$. Dark green coloured $\mathrm{K}_2 \mathrm{MnO}_4$ disproportionates in a neutral or acidic medium to give permanganate.
$E$. With increasing oxidation number of transition metal, ionic character of the oxides decreases.
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