Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 520 off


1.      Exactly 0.200 mole electrons is passed through two electrolytic cells in series. One contains silver ion, and the other, zinc  ion .assume that the only cathode reaction in each cell is the reduction  of the ion to the metal. How many grams of each metal will be deposited? (at. Mass of zn = 65, ag = 108)

a.       108g ag and 65 g zn.

b.      108 ag and 32.5g zn.

c.       21.6 ag and 6.5 g zn.

d.      21.6 g ag and 13 g zn.


2.       A steady current of 30.0A for 70.2 min corresponds to a passage of                                                  a.   1.2610^5  electrons.

 b.  1.26×10^5 f.

 c.  1.31 f.

 d.  1.31 c.


3.   Cu+ is not stable and undergoes disproportion. E for cu+ disproportionation.

(E°  cu2+/cu =0.153V , E°  cu+/cu=0.53V).



7 years ago


Answers : (4)



Ans 1:

For silver , the conversion is Ag+ + e- -> Ag

Therefore 1 mole of electrons are reqd to make 1 mole i.e 108 gm of silver. hence .2 moles of electron will make .2x108 = 21.6 gm of silver.


For zinc, the connversion is Zn2+ + 2e- -> Zn

Therefore 2 moles of elctrons are reqd to make 1 mole i.e 65 gm of zinc, hence .2 mole electrons shall make .2x65/2 = 6.5 gm of zinc.

7 years ago


Ans 2:

For a steady flow, the current I in amperes can be calculated with the following equation:

I = {Q \over t}


Q is the electric charge in coulombs transferred
t is the time in seconds

More generally, electric current can be represented as the time rate of change of charge, or

I = \frac{dQ}{dt}.

therefore, Q= 30 A x 70.2 x 60 sec = 126360 coulombs

1 faraday = 96 485.3415 coulombs


Therefore answer is 126360/96485.3415 = 1.31 faraday

7 years ago


Please repost the third question, the question is not clear.

7 years ago

1)       for silver deposition :       Ag+     +     e-             ------>   Ag

                                                                     1 mole                   1 mole

         so , 0.2 moles of Ag is deposited i.e., 0.2*108 = 21.6 grams


        for zinc deposition :   Zn2+     +   2e-                ------>    Zn

                                                              2 mole                       1 mole

        so , 0.1 moles of Zn is deposited i.e., 0.1*65 =  6.5 grams

        So option is C


2)   Electric current is the rate of charge flow past a given point in an electric circuit, measured in Coulombs/second which is named Amperes

     so Q = i*t


     Q = 126360 Coulombs

    but 1 faraday = 96485 Coulombs

    So its Q = 1.31 faraday

    So option is C



3) I want to make a small correction to question reg. elecric potential of  cu2+/cu+ ( taken frm standard books )

Its cu2+/cu+ =0.153V  i.e.,                     cu2+ + e-   ------>  cu           E0 = 0.153 V

Now going into problem:  Cu+ solutions, tend to give a disproportion reaction:

                                                       2Cu+ ----- >   Cu + Cu2+


                     cu+ + e-    ------>  cu                                E0 = 0.53 V        so,  nE0 = 0.53 V   

                     cu+            ------>  cu2+ + e-               E0 = - 0.153 V       so,   nE0 = - 0.153 V

on adding above rxns we get  

 2Cu+ ----- >   Cu + Cu2+                  with  E0 = +0.377 V  

7 years ago

Post Your Answer

Other Related Questions on Physical Chemistry

what is meant by entropy..........................................................?
@ sharda entropy of a system is actually the measurement of degree of randomess ordisorderliness of a system . it is a thermodynamic property and represented by a letter S . the entropyof...
Umakant biswal 4 months ago
entropy is the sudden change in randomness of the system due to may be from exapnding, contracting, collision etc. small example → take a glass of water and Eno. eno prsesnt in packed...
cris gayle 4 months ago
entropy is the sudden change in randomness of the system due to may be from exapnding, contracting, collision etc. small example → take a glass of water and Eno. eno prsesnt in packed paper...
Vikas TU 4 months ago
In the chapter Solid State Class 12, how to classify any solid or elements on the basis of their bonds i.e. covalent bond, molecular bond etc ???
Depending upon the type of bonding present , Solids can be divided as : 1) Covalent Solids 2) Ionic solids 3) Molecular solids 4) Metallic solids
Suraj Prasad 6 months ago
Ok , thats the same thing i told , u just need to see the configuration of examples . i am giving that below potassium sulphate – ionic solid tin – mettalic solid benzene – molecular (non...
Umakant biswal 6 months ago
@ shreyas On the besic of bond present there are no such classification as tetraphosphorous decosides , and aluminium phosphates . Besic of the bond there are 4 types of classification 1-...
Umakant biswal 6 months ago
what is the oxidation state of sulphur in H 2 S 2 O 8, Na 2 S 4 O 8 and Na 2 S 2 O 3.
@ bhavika in H2S2O8, since 2 oxygen is forming the peroxide linkage here , so, the o.n of sulpher will be +6 . and in the 2 nd case NA2S4O8 , in thaat case take sulpher o.n to be x after...
Umakant biswal 6 months ago
You no longer have to wait desperately for someone to help resolve your doubt. You can chat with IITians live, 24/7 (even at 3AM!) and get your doubt resolved instantly. Try the HashLearn...
Ankit 6 months ago
u need to remember that which structure have peroxide linkage and which structure have not , there are only some exception with peroxide linkage , go through the ncert redox reaction chapter...
Umakant biswal 6 months ago
the hybridization of phosphorus in PCl 5 (in solid state ) is 1)sp 3 2)sp 3 d 2 3)sp 3 d 4)both 1 and 2
sp3d is the right answer. In excited state, intermixing of a 3s, three 3p and one 3d orbitals gives five half filled sp 3 d hybrid orbitals, which are arranged in trigonal bipyramidal...
dolly bhatia one month ago
@ krishna option no 3 turns out to be the correct option , here , the orbitals are filled by electrons of five cl atom . there are 5 p-cl sigma bond , three in one plane and make an angle of...
Umakant biswal 3 months ago
i hope to no.3 because phosphours atom contain in last subshell is 5 electron and not contain a lone pair and here is 5 chlorine atom .then we add up eletron and we get a 10 and we devided...
sahabudin ali 2 months ago
It should be option 4 as PCl5 exists in [PCl4]+ and [PCl6]- in solid in first case it is Sp3 and that in second it is Sp3d2
4 days ago
sir iam a iiit students in RAGIV GANDHI UNIVERSITY OF TECHNOLOGIES, there is a semister it infront of me in 10 days.i don’t know any thing about is a ncert syllubus.please send...
@ badugu they are ncert books topic , i am mentioning some imp chapter name below 1- COORDINATION COMPOUND ( PART 2 CHEMI ) 2- GENERAL PRINCIPLES OF ORGANIC CHEMISTRY ( 11TH 2ND PART ) 3-...
Umakant biswal one month ago
Dear Vijay, Go through these topics first as atmost importat ones: Aldehyde and Ketones Biomolecules Alcohols and ethers Coordination Compounds Solid states Electrrochemistry Solutions D and...
Vikas TU one month ago
@ badugu , kindly be specific in asking the ques , earlier u told that u have ncert syllabus , and i have given the chapters from ncert textbooks only . kindly conform which publication u...
Umakant biswal one month ago
How many unpaired electrons are present in superoxide ion?
But the answer is 3.. As in molecular orbital theory the unpaired electrons in oxygen molecule is 2.. It accepts 1 electron to form superoxide ion.. That electron instead of pairing with 2...
Suraj Singh 16 days ago
And now I am agree with my solution.. You should check it once.... .. And thanq for the concern... .....
Suraj Singh 16 days ago
It`s unfortunately wrong..................................... ................. NOť less than 100 char
Suraj Singh 17 days ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,000 off

Get extra R 520 off

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details