Question

Which of the following statement is correct about the balanced equation given below? \[ Cr_2O_7^{2-}(aq)+14H^+(aq)+3S^{2-}(aq) \rightarrow 2Cr^{3+}(aq)+3S(s)+7H_2O(l) \]

• A. \(Cr_2O_7^{2-}\) reduces the \(S^{2-}\)
• B. Oxidation number of Cr changes from +7 to +3
• C. Oxidation number of S remains -2
• D. \(Cr_2O_7^{2-}\) oxidises the \(S^{2-}\)

Hint:

Dichromate ion \((Cr_2O_7^{2-})\) is a powerful oxidizing agent in acidic medium.

Answer 1

The Correct Option is D