1.

Which of the followig is false?

Answer»

Saline water slows down rusting
In DANIELL cel, if concentrations of the solutions are DOUBLED, the EMF of the cell is also doubled.
EMF of a cell is an intensive whereas free energy change, `DeltaG` is extensive.
Galvanised iro sheets remain protected from rusting EVEN if a crack is developed.

Solution :Saline water speeds up rusting. Hence, (a) is false.
`Zn+Cu^(2+)toZn^(2+)+Cu,E_(cell)=E_(cell)^(@)-(0.0591)/(2)"log"([Zn^(2+)])/([Cu^(2+)])`
If `[Zn^(2+)]` and `[Cu^(2+)]` are doubled, there is no effect on EMF, hence (B) is wrong.


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