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The standard reduction potential for Mg^...

The standard reduction potential for `Mg^(2+)//Mg` is 2.37 V and for `Cu^(2+)//Cu` is 0.337 The `E_(cell)^(@)` for the following reaction `Mg+Cu^(2+) rarr Mg^(2+)+Cu` is

A

`+2.03 V`

B

`-2.03 V`

C

`-2.7 V`

D

`+2.7 V`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(cell)^(@) =E_(cathode)^(@)-E_(anode)^(@)`
`=E_(cu^(2+)//Cu)^(@)-E^(@)`
`=0.337 -(-2.37 )V=2.7V`
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