• 072920 77839
  • info@smartachievers.in
Menu
Back
  • JEE ADVANCE
  • JEE MAIN
  • NEET
  • BITSAT
  • CBSE BOARD
  • UP BOARD
  • CUET
JEE ADVANCE
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
JEE MAIN
  • CLASS XI - XII
  • CRASH COURSE
CRASH COURSE
NEET
  • CLASS XI - XII
  • CRASH COURSE
BITSAT
  • CLASS XI - XII
CBSE BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
  • CLASS VI
  • CLASS VII
  • CLASS VIII
UP BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
CUET
  • CRASH COURSE
Courses


Solution


Q.

Match List I with List II.

  List I   List II
  (Cell)   (Use/Property/Reaction)
A. Leclanche cell I. Converts energy of combustion into electrical energy
B. Ni-Cd cell II. Does not involve any ion in solution and is used in hearing aids
C. Fuel cell III. Rechargeable
D. Mercury cell IV. Reaction at anode Zn→Zn2++2e-

 

Choose the correct answer from the options given below:                    [2024]
1 A–II, B–III, C–IV, D–I  
2 A–III, B–I, C–IV, D–II  
3 A–I, B–II, C–III, D–IV  
4 A–IV, B–III, C–I, D–II  

Ans.

(4)

 A. Leclanche cell: It is commonly used dry cell in our clocks. The cell consists of a zinc container that also acts as anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon. The space between the electrodes is filled by a moist paste of ammonium chloride and zinc chloride.

      Anode reaction:  Zn(s)→Zn2++2e-

      Cathode reaction: MnO2+NH4++e-→MnO(OH)+NH3

B. Ni-Cd cell: It is a rechargeable cell. It is more expensive to manufacture than a lead storage battery.

      Cd(s)+2Ni(OH)3(s)→CdO(s)+2Ni(OH)2(s)+H2O(l)

C. Fuel cell: These are galvanic cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc., directly into electrical energy.

D. Mercury cell:

       Zn(Hg)+HgO(s)→ZnO(s)+Hg(l)

 The cell potential is approximately 1.35 V and remains constant during its life as the overall reaction does not involve any ion in solution whose concentration can change during its lifetime.