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Limiting Reagent or Reactant

A volume of ...

Question

A volume of $12.5$ mL, $0.05$ M $S e O_{2}$ reacts with $25$ mL of $C r S O_{4}$ which is oxidised to $0.1$ M $C r^{3 -}$ .

The oxidation state at which selenium is converted by the reaction is_________.

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Solution

$25 m l \times 0.1 M$ of $C r = 4 \times 12.5 m L \times 0.05 M$ of $S e$
The oxidation state of Cr increases from +2 to +3.
Hence, the oxidation state of Se will decrease from +4 to 0.

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