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In an experiment, 50 " mL of " 0.1 M sol...

In an experiment, 50 " mL of " 0.1 M solution of a metallic salt reacted exactly with 25 " mL of " 0.1 M solution of sodium sulphite. In the reaction, `SO_(3)^(2-)` is oxidised to `SO_(4)^(2-)`. If the original oxidation nubmer of the metal in the salt was 3, what would be the new oxidation number of the metal?

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