Given: Conductivity of CH₃COOH solution,
K= 3.905 x 10^-5 S cm^-1
Concentration of CH₃COOH solution,
C = 0.001 mol L^-I ,
Molar conductivity,
\(\lambda _{ m }=k\times \frac { 1000 }{ C } \)
\(=\frac { \left( 3.905\times 10^{ -5 }Scm^{ -1 } \right) \times \left( 1000\quad cm^{ 3 }L^{ -1 } \right) }{ 0.001molL^{ -1 } } \)
= 39.05 S cm²mol^-1
Molar conductivity at infinite dilution \(\left( \lambda ^{ 0 }_{ m } \right) \)  for CH₃COOH
\(\lambda ^{ 0 }_{ m }CH_{ 3 }COOH=\lambda ^{ 0 }_{ m }CH_{ 3 }COO^{ - }+\lambda ^{ 0 }_{ H+ }\)
= 40.9 + 349.6 S cm² mol^-1
= 390.5 S  cm² mol^-1
Degree of dissociation, \(\alpha =\frac { \lambda _{ m } }{ \lambda ^{ 0 }_{ m } } \)
\(=\frac { 39.05\quad s\quad cm^{ 2 }mol^{ -1 } }{ 39.05\quad s\quad cm^{ 2 }mol^{ -1 } } =0.1\)
(ii) A device used to convert the chemical energy produced in a spontaneous redox reaction into electrical energy is called an electrochemical cell.
When external potential applied becomes greater than E^0_cell of electrochemical cell. electrons flow from cathode to anode, i.e. electrochemical cell behaves like an I electrolytic cell.

At anode \(Zn(s)\longrightarrow Zn^{ 2+ }(aq)+2e^{ - }\)
At cathode \(Sn^{ 2+ }(aq)+2e^{ - }\longrightarrow sn(s)\)
Overall reaction
\(Zn(s)+Sn^{ 2+ }(aq)\longrightarrow zn^{ 2+ }(aq)+Sn(s)\)
\(E^{ 0 }_{ cell }=E^{ 0 }_{ sin2+/sn }-(-E^{ 0 }_{ zn2+/zn })\)
= -0.14 + 0.76 = 0.62 V
\(\triangle G^{ 0 }=-nFE^{ 0 }\)
= -2 x 96500 x 0.62
\(\triangle G^{ 0 }=-119660Jmol^{ -1 }\) 

(i) India is a tropical country and summer extend over a long period. This means solar power plants are very effective and can be a better substitute of electricity.
(ii) We must hold seminars with the help of NGO's and other organisations. Educate people about the use of solar heaters, solar generators, solar cookers and solar batteries. We can explain the advantages of the use of solar power over electricity.

Adding the two half reaction, EMF comes out to +ve. This means that Co(III) in aqueous solution has the tendency to change to Co(II). Hence, Co(III) is not stable in aqueous solution.