MCQ
The oxidation states of phosphorus vary from
- ✓$-3$ to $+5$
- B$-1$ to $+1$
- C$-3$ to $+3$
- D$-5$ to $+1$
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$aCr _2 O _7^{2-}+ bSO _3^{2-}( aq )+ cH ^{+}( aq ) \rightarrow 2 aCr ^{3+}( aq )+ bSO _4^{2-}( aq )+\frac{ c }{2} H _2 O ( l )$
the coefficients a, b and $c$ are found to be, respectively-