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E^(@) of two reactions are given below ...

`E^(@) ` of two reactions are given below :
`Cr^(3+) + 3e rarr Cr, E^(@) = -0.74 V`
`OCl^(-) + H_(2)O + 2e rarr Cl^(-) + 2OH^(-), E^(@) = 0.94 V`
What will be the `E^(@)` for ?
`3OCl^(-) + 2Cr + 3H_(2)O rarr 2Cr^(3+) + 3Cl^(-) + 6OH^(-)`

A

`1.68 V`

B

`0.20 V`

C

`-1.68 V`

D

`-0.20 V`

Text Solution

Verified by Experts

The correct Answer is:
A
`E^(@) = E_(OP_(Cr))^(@) + E_(RP_(OCl^(-)))^(@)`
`= 0.74 + 0.94 = 1.68 V`
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