Electrochemistry

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct Option: (iii)

(i) Conductivity of solution depends upon the size of ions as more is the size of ion, mobility decreases, and conductivity decreases so this option is incorrect.

(ii) Viscosity is the measure of the resistance of a liquid to flow. Greater will be the viscosity of solvent, less will be the flow of electrons and lesser will be the conductivity. Therefore, this option is incorrect.

(iii) Conductivity depends on the solvation of ions in the solution. Greater is the solvation, lesser will be the conductivity of the solution. Therefore, this option is correct.

(iv) On increasing temperature the moving ions acquire higher kinetic energy and move with higher speeds thus increasing conductivity. Therefore, this option is incorrect

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct Option: (iv)

  (i) Inert electrodes like graphite are a source of electrons in a reaction. It doesn't participate in a chemical reaction. Therefore, this option is incorrect

(ii) Inert electrode chemically doesn't participate in the reaction but it provides a surface either for oxidation and reduction reaction. Therefore, this option is incorrect

(iii) Inert electrodes provide surface for conduction of electrons so this option is incorrect.

(iv) Inert electrodes cease transfer of electrons for oxidation or reduction but not for redox reaction. Therefore, this option is correct.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct Option: (iii)

(i) The properties which don't depend on the mass of species are termed intensive properties. E_Cell is an intensive property that doesn't depend on the mass of the species.? _rG is an extensive property as it depends on the mass of the species. Therefore, this option is incorrect

(ii) E_Cell is an intensive property but? _rG is an extensive property so this option is incorrect

(iii) The properties which don't depend on the mass of species are termed intensive properties E_Cell is an intensive property that doesn't depend on the mass of the species.? _rG is an extensive property as it depends on the mass of the species. Therefore, this option is correct

(iv)  E_Cell is an intensive property but? _rG is an extensive property so this option is incorrect.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct Option: (iii)

  (i) For measurement of electrode potential standard conditions must be met which is 1 bar pressure and 1M concentration which is not here so this option is incorrect.

(ii) For measurement of electrodes potential standard conditions must be met which is 1 bar pressure and 1M concentration which is not here so this option is incorrect.

(iii) When copper electrode is connected to SHE it acts as cathode and its standard electrode potential can be measured as follows

E $°=$ E $°$ _R- E $°$ _L

For calculationn of standard potential of a given cell it should be coupled with SHE and standard conditions such as 1 bar pressure and 1M concentration and the concentrations of oxidised and reduced forms is one so this option is correct.

(iv) For measurement of electrode potential standard conditions must be met which is 1 bar pressure and 1M concentration which is not here so this option is incorrect.