NEETChemistryElectrochemistry
Match List-I with List-II. ( array |l|l|l|l| & List-I & & List-II A & array l Cd ( s )+2 Ni ( OH )₃ ~( s ) CdO ( s )+2 Ni ( OH )₂ ~( s )+ H ₂ O ( l ) array & I & Primary battery B & array l Zn ( Hg )+ HgO ( s ) ZnO ( s )+ Hg ( l ) array & II & Discharging of secondary battery C & array l 2 PbSO ₄ ~( s )+2 H ₂ O ( I ) Pb ( s )+ PbO ₂ ~( s )+2 H ₂ SO ₄( aq ) array & III & Fuel cell D & array l 2 H ₂ ~( g )+ O ₂ ~( g )
Options
- AA - I , B - II , C - III , C - IV
- BA - IV , B - I , C - IV , C - III
- CA - II , B - I , C - IV , C - III
- 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 . The electrode reaction