JEE Main 2014 Chemistry question

Chemistry Redox Reactions JEE Main 2014

How many electrons are involved in the following redox reaction? Cr_2O_7^{2-} + Fe^{2+} + C_2O_4^{2-} \to Cr^{3+} + Fe^{3+} + CO_2 (Unbalanced)

(1)6Correct
(2)5
(3)3
(4)4

Answer: (1)

Solution

The only reduction in the equation is dichromate to chromium(III). Each chromium goes from +6 to +3, and there are two of them, so the

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Question ID VK-104651