1.

The number of moles of electron required to reduce 0.2 mole ofCr_(2)O_(7)^(2-) to Cr^(3+)

Answer»

6
1.2
0.6
12

Solution :`Cr_(-2)O_(7)^(2-)+14H^(+)+6e^(-)to2Cr^(3+)+7H_(2)O`
1-6
0.2 - X`implies` 1.2


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