MCQ
The oxidation number of phosphorus vary from
- A$-1$ to $+3$
- B$-3$ to $+3$
- ✓$-3$ to $+5$
- D$-5$ to $+1$
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Statement $(I)$ : Fusion of $\mathrm{MnO}_2$ with $\mathrm{KOH}$ and an oxidising agent gives dark green $\mathrm{K}_2 \mathrm{MnO}_4$.
Statement $(II)$ : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.
In the light of the above statements, choose the correct answer from the options given below.

$2X_2(s) + 3Y^{2+} (aq) \to 2X_2^{3+}(aq) + 3Y(s)$
[Given : Molal depression constant of water = $1.85 \,K \,kg \,mol ^{-1}$ Freezing point of pure water $\left.=0^{\circ} C \right]$