Dry cell, lead accumulator and fuel cells — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Which battery is a common example of a secondary, rechargeable cell?

• A. Lead accumulator
• B. Leclanche dry cell
• C. Primary zinc-carbon dry cell
• D. Simple Daniell cell used once only

Question 2 · difficulty L2 · understanding

In a conventional zinc-carbon dry cell, the zinc container primarily acts as the

• A. anode
• B. cathode
• C. salt bridge
• D. inert separator only

Question 3 · difficulty L2 · understanding

A major advantage of a fuel cell over an ordinary primary cell is that a fuel cell

• A. can continue operating while fuel and oxidant are supplied
• B. contains no redox reactions
• C. cannot produce electrical energy continuously
• D. must be discarded after one reaction event

Question 4 · difficulty L2 · understanding

During discharge of a lead-acid accumulator, both electrodes are ultimately converted largely to

• A. $PbSO_4$
• B. $PbO_2$ only
• C. metallic Pb only
• D. $PbCl_2$

Question 5 · difficulty L3 · application

Which statement correctly describes the lead-acid accumulator during charging?

• A. The discharge reactions are driven in reverse by an external power source
• B. The cell chemistry remains unchanged
• C. Both electrodes dissolve completely
• D. No redox reaction occurs

Question 6 · difficulty L3 · application

In a hydrogen-oxygen fuel cell, the overall reaction is essentially

• A. formation of water from hydrogen and oxygen
• B. decomposition of water into hydrogen and oxygen
• C. formation of carbon dioxide only
• D. oxidation of nitrogen

Question 7 · difficulty L3 · application

Which component is consumed as the reducing fuel in a hydrogen-oxygen fuel cell?

• A. Hydrogen
• B. Oxygen
• C. Water
• D. The external wire

Question 8 · difficulty L3 · application

Why is a lead accumulator described as rechargeable?

• A. Its discharge reactions can be reversed electrochemically by applying an external voltage
• B. Its electrodes never change during use
• C. It contains no electrolyte
• D. It produces fuel internally forever

Question 9 · difficulty L4 · application

During discharge of a lead-acid cell, sulfuric acid concentration generally decreases. Why?

• A. Sulfate ions become incorporated into $PbSO_4$ and water is formed
• B. Sulfuric acid is converted only to oxygen gas
• C. Lead sulfate dissolves to make more acid
• D. No sulfate participates in the reaction

Question 10 · difficulty L4 · application

Which pairing is correct?

• A. Dry cell — primary; lead accumulator — secondary; hydrogen-oxygen fuel cell — externally supplied reactants
• B. Dry cell — secondary; lead accumulator — primary; fuel cell — no redox reaction
• C. All three are primary sealed cells
• D. Lead accumulator — fuel cell; dry cell — electrolytic cell only