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Which of the following option about secondary cells is/are correct? It consists of a lead anode and a grid of lead packed with lead dioxide (PbO2 ) as a cathode.  A 58% solution of sulphuric acid is used as an electrolyte.

Which of the following option about secondary cells is/are correct? It consists of a lead anode and a grid of lead packed with lead dioxide (PbO2 ) as a cathode.  A 58% solution of sulphuric acid is used as an electrolyte. Correct Answer Option 1 is correct

The correct answer is 1 i.e. Option 1 is correct.

Secondary cells:

  • A secondary cell after use can be recharged by passing a current through it in the opposite direction so that it can be used again. 
  • A good secondary cell can undergo a large number of discharging and charging cycles. 
  • 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 a cathode. 
  • A 38% solution of sulphuric acid is used as an electrolyte.
  • The cell reactions when the battery is in use are given below:
            Anode: Pb(s) + SO42- (aq) → PbSO4(s) + 2e–
            Cathode: PbO2(s) + SO42- –(aq) + 4H+(aq) + 2e– → PbSO4 (s) + 2H2O (l ) 
  • Overall cell reaction consisting of cathode and anode reactions is:
             Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)
  • On charging the battery the reaction is reversed and PbSO4(s) on anode and cathode is converted into Pb and PbO2, respectively.
  • Another important secondary cell is the nickel-cadmium cell which has a longer life than the lead storage cell but more expensive to manufacture.
  • We shall not go into details of the working of the cell and the electrode reactions during charging and discharging.
  • The overall reaction during discharge is:
             Cd (s) + 2Ni(OH)3 (s) → CdO (s) + 2Ni(OH)2 (s) + H2O (l )

Related Questions

Which of the following are the active materials of a lead-acid cell? 1) Lead Peroxide (PbO2) for positive plate 2) Sponge Lead (Pb) for negative plate 3) Concentrated Sulphuric acid (H2SO4) as electrolyte 4) Dilute Sulphuric acid (H2SO4) as electrolyte
Choose the right option among the alternatives – A thyristor goes into full conduction in its forward direction when anode/cathode/gate is positive with respect to its anode/cathode/gate and a turn-on voltage or current signal in the form of a pulse is given to its anode/ cathode/gate.
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P. CD4+ cells make contact with macrophages and stimulate their microbicidal activity.
Q. CD4+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
R. CD8+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
S. CD8+ cells make contact with virus infected cells and kill them.
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Statement:
Sulphuric acid is acidic in nature.
Conclusion:
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