Question

When SO₂ is passed through an acidified solution of potassium dichromate, then chromium sulphate is formed. The change in the valency of chromium is ______.

पर्याय

• +4 to +2

• +5 to +3

• +6 to +3

• +7 to +2

Answer 1

When SO₂ is passed through an acidified solution of potassium dichromate, then chromium sulphate is formed. The change in the valency of chromium is +6 to +3.

Explanation:

\[\ce{K2Cr2O7 + 3SO2 + 4H2SO4 -> K2SO4 + Cr2(SO4)3 + 3SO3 + 4H2O}\]

The oxidation number of chromium changes from +6 to +3.