An external emf of 2.2 V is required for...

An external emf of 2.2 V is required for the manufacture of `Cl_(2)` from brine - why ?

Text Solution

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`2Cl^(-)(aq)+2H_(2)O(l)rarr2OH^(-)(aq)+H_(2)(g)+Cl_(2)(g).`
`DeltaG^(@)` of this reaction is `+422kJ`. Now, from the equation `DeltaG^(@)=-nFE^(@)`, we get, `E^(@)=-2.2V`. For this reason, the manufacture of chlorine from brine requires an external emf more than 2.2V.

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During manufacture of chlorine from brine -

`DeltaG^(@)` of the overall reaction is `-ve`

`DeltaG^(@)` of the overall reaction is `+ve`

the value of `DeltaE^(@)` of the overall reaction is `-ve`

the value of `DeltaE^(@)` of the overall reaction is `+ve`

A current flowing through a coil changes from +2A to -2A in 0.05 s and an emf of 8 V is induced in the coil. The value of self-inductance of the coil is

0.8 H

0.1 H

0.2 H

0.4 H

Statement I : An external circuit can draw a maximum power of 9 W from a source of emf V and internal resistance 1Omega . Statement II : The condition , for which an external circuit of resistance R draws the maximum power from a source of internal reistance r , is R =r

Statement I is true , Statement II is true , Statement II is a correct explanation for Statement I

Statement I is true , Statement II is true , Statement is not a correct explanation for statement I

Statement I is true , Statement II is false

Statement I is false , Statement II is true