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Match List-I with List-II. List-I List-II A Cd s + 2 Ni OH 3 s → CdO s + 2 Ni OH 2 s + H 2 O l I Primary battery B Zn Hg + HgO s → ZnO s + Hg l II Discharging of secondary battery C 2 PbSO 4 s + 2 H 2 O I → Pb s + PbO 2 s + 2 H 2 SO 4 aq III Fuel cell D 2 H 2 g + O 2 g → 2 H 2 O l IV Charging of secondary battery Choose the correct answer from the options given below

Options

  1. AA - I , B - II , C - III , C - IV
  2. BA - IV , B - I , C - IV , C - III
  3. CA - II , B - I , C - IV , C - III
  4. DA - II , B - I , C - III , C - IV

Correct answer

C. A - II , B - I , C - IV , C - III

Step-by-step solution

(a) Cd s + 2 Ni OH 3 s → CdO s + 2 Ni OH 2 s + H 2 O l Discharge of secondary Battery (b) Zn Hg + HgO s → ZnO s + Hg l (Primary Battery Mercury cell) (c) 2 PbSO 4 s + 2 H 2 O l → Pb s + PbO 2 s + 2 H 2 SO 4 aq Charging of secondary Battery (d) 2 H 2 g + O 2 g → 2 H 2 O l - Fuel cell 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

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