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अर्ध -सेल अभिक्रियांए निम्न है - Mn^(2...

अर्ध -सेल अभिक्रियांए निम्न है -
`Mn^(2+) + 2e^(-) to Mn, E^(@) = -1.18 V`
`2(Mn^(3+) + e^(-) to Mn^(2+)), E^(@) = +1.51 V`
`3Mn^(2+) to Mn + 2Mn^(3+)` के लिए मान होगा

A

`- 2.69 V` , अभिक्रिया नहीं होगी

B

`- 2.69 V`, अभिक्रिया होगी

C

`- 0.33 V`, अभिक्रिया नहीं होगी

D

`-0.33 V`, अभिक्रिया होगी

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG^@ = -nFE^@`
`Mn^(+2) + 2e^(-) to Mn " " …(1)`
`DeltaG = - 2 xx F xx (-1.18) = +2.36 F`
`2Mn^(+3) + 2e^(-) to 2Mn^(+2) " "…(2)`
`DeltaG = -2 xx F xx (-1.51) = +3.02 F`
`(1) + (2)`
`3Mn^(+2) to Mn + 2Mn^(+3)`
`DeltaG = +2.36F + (3.02F) = 5.38 F`
`DeltaG = -2 xx F xx E`
`E = (5.38 F)/(-2 xx F) = -2.69 V`
हम जानते है के जब Ecell `lt 0 ` होता है , तब सेल प्रक्रिया अस्वतः होती है |
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