Question

in acidic medium dichromate Ion oxidized ferrous sulphate to ferric sulphate and and it self reduced to chromium 3 + ions write a balanced equation to represent this this redox reaction use Ion electron method ​

Answer 1

Cr

2

O

7

2−

+14H

+

+6Fe

2+

→2Cr

3+

+6Fe

3+

+7H

2

O

During the reaction, the oxidation number of Cr decreases from +6 to +3. Net decrease in the oxidation number of one Cr atom is 6−3=3. For 2 Cr atoms (in dichromate ion), the total decrease in the oxidation number is 2×3=6

The gram equivalent weight =

Total change in the oxidation number

gram molecular weight

=

6

294

=49