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Solution


Q.

Match List-I with List-II                   [2025]

  List-I   List-II
  (Applications)   (Batteries/Cell)
A. Transistors I. Anode–Zn/Hg; Cathode–HgO + C
B. Hearing aids II. Hydrogen fuel cell
C. Invertors III. Anode–Zn; Cathode–Carbon
D. Apollo space ship IV. Anode–Pb; Cathode–Pb | PbO2

 

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

Ans.

(1)

(A) Dry cell which is used commonly in our transistors and clocks, 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.

(B) Mercury cell, suitable for low current devices like hearing aids, watches, etc. consists of zinc–mercury amalgam as anode and a paste of HgO and carbon as the cathode. The electrolyte is a paste of KOH and ZnO.

(C) The most important secondary cell is the lead storage battery commonly used in automobiles and invertors. It consists of a lead anode and a grid of lead packed with lead dioxide (PbO2) as cathode. A 38% solution of sulphuric acid is used as an electrolyte.

(D) One of the most successful fuel cells uses the reaction of hydrogen with oxygen to form water. The cell was used for providing electrical power in the Apollo space programme.