JEE Mains Model Paper 20

In an experiment 50 mL of 0.1 M solution of a salt reacted with 25 mL of 0.1 M solution ofsodium sulphite. The half equation for the oxidation of sulphite ion is
SO32− (aq) + H2O (l) → SO42− (aq) + 2H+ (aq) + 2e− . If the oxidation number of metal in the salt was3, what would be the new oxidation number of the metal?