Q. 25

E° cell for the given redox reaction is 2.71

Mg(s) + Cu2+ (0.01 M) ––– Mg2+ (0.001 M) + Cu(s)

Calculate Ecell for the reaction. Write the direction of flow of current when an external opposite potential applied is

(i) less than 2.71 V and

(ii) greater than 2.71 V

OR

(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO4 and ZnSO4 until 2.8 g of

Fe deposited at the cathode of cell X. How long did the current flow ? Calculate the mass of Zn deposited at the cathode of cell Y.

(Molar mass : Fe = 56 g mol-1 Zn = 65.3 g mol-1, 1F = 96500 C mol-1)

(b) In the plot of molar conductivity (^m) vs square root of concentration (c1/2), following curves are obtained for two electrolytes A and B :



Answer the following :

(i) Predict the nature of electrolytes A and B.

(ii) What happens on extrapolation of ^m to concentration approaching zero for electrolytes A and B?

Answer :

Mg(s) + Cu2+ (0.01 M) ––– Mg2+ (0.001 M) + Cu(s)


(i) less than 2.71V, current will flow from copper to magnesium


(ii) more than 2.71V, curret will from magnesium to copper


OR


a) (i)



2.8g of Fe requires = (2) (96500)(2.8)/(56)


= 9650 Coulombs


Q= It = (9650)(2) = 4825 sec


(ii)



(2) (96500) C of electricity deposit Zn = 65.3g


Therefore, 96500 C of electricity deposit Zn = (65.3) (96500)(9650) = 3.265g


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
All About Faraday's lawAll About Faraday's lawAll About Faraday's law55 mins
Revision Class | All Formulas of ElectrodynamicsRevision Class | All Formulas of ElectrodynamicsRevision Class | All Formulas of Electrodynamics63 mins
Know all about InfertilityKnow all about InfertilityKnow all about Infertility39 mins
Get to know all about Immune SystemGet to know all about Immune SystemGet to know all about Immune System60 mins
Know all about Colligative PropertiesKnow all about Colligative PropertiesKnow all about Colligative Properties50 mins
Know All About Types of RelationsKnow All About Types of RelationsKnow All About Types of Relations53 mins
Exemplar Special Quiz | Reproductive Health Part 1Exemplar Special Quiz | Reproductive Health Part 1Exemplar Special Quiz | Reproductive Health Part 127 mins
Conic Section Part 1Conic Section Part 1Conic Section Part 164 mins
 Exemplar Special Quiz | Human Health & Diseases Part 1 Exemplar Special Quiz | Human Health & Diseases Part 1 Exemplar Special Quiz | Human Health & Diseases Part 139 mins
Exemplar Special Quiz | Sexual Reproduction in flowering Plants Part 1Exemplar Special Quiz | Sexual Reproduction in flowering Plants Part 1Exemplar Special Quiz | Sexual Reproduction in flowering Plants Part 132 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :