KVPY SA Exam 2015 Question Paper

Question : 44 of 80

Marks: +1, -0

The number of electrons required to reduce chromium completely in

Cr_2O_ 7^{2-}\to Cr^{3+}

in acidic medium, is

Solution:

Cr_2O_ 7^{2-} + 14H^{+} + 6e^{–} {––––▸} 2Cr^{3+}+ 7H_2O

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