When DeltaG is positive, the reaction is...

When `DeltaG` is positive, the reaction is not spontaneous. Then to make such reaction spontaneous, which method is followed?

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A reaction occurs spontaneously if :

`TtriangleSgttriangleH and triangleH` is +ve and `triangleS is -ve`

`TtriangleS=triangleH`and both `triangleH `and` triangleS` are +ve

`TtriangleSlttriangleH` and both `triangleH` and `triangleS` is +ve

`TtriangleSgttriangleH` and both `triangleH` and `triangleS`are is +ve

Which is not a spontaneous process:

Expansion of a gas into vacum

Water flowing down hill

Heat flowing from colder body to a hotter body

Evaporation of water from clothes during drying

For a redox reaction to be spontaneous, the EMF should be

-ve

+ve

zero

any one of these