1.

In a simple Galvanic cell , which is in standard state, half cell reactions with their appropriate oxidation potentials are {:(Pb (s) - 2e^(-) to Pb^(2+) (aq) E^(@) = +0.13 "volt") , (Ag (s) - e^(-) to Ag^(2+) (aq) E^(@) = - 0.80 "volt"):} Which of the following reaction takes place ?

Answer»

`PB^(2+) (AQ.) + 2 Ag (s) to 2 Ag^(+) (aq.) + Pb (s)`
`Pb^(2+) (aq.) + Ag(s) to Ag^(+) (aq.) + Pb (s)`
`Ag^(+) (aq.) + Pb(s) to Ag(s) + Pb^(2+) (aq.)`
`2 Ag^(+) (aq.) + Pb(s) to 2 Ag(s) + Pb^(2+) (aq.)`

Solution :Check the spontaneity of each reaction by finding E.M.F. For a SPONTANEOUS reaction, EMF should be +ve .


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