Answer to Question #76556 in Physical Chemistry for Praise

Question

In a reaction it was found that 3.0g of a metal *X* was oxidized by 25.0 cm³ of 0.10 mol dm-³ K2 Cr2 O2 under acidic conditions.
(i) Deduce the mole of ratio between *X* and Cr2 O7²- ion.
(ii) write a balanced equation of the redox reaction.
(iii) Give the oxidation numbers of chromium and *X* in both their reduced and oxidized forms.

[Molar mass of *X* = 200.6]