Assertion (A) : For a Daniell cell, Zn/Zn2*(1M) || Cu2+ (1M)/Cu with E°cell = 1.1 V, if the external opposing potential is more than 1.1 V, the electrons flow from Cu to Zn.
Reason (R) : Cell acts like a galvanic cell.
Ans. Let’s analyze the given Assertion (A) and Reason (R):
Assertion (A): For a Daniell cell, Zn/Zn2+(1M) || Cu2+(1M)/Cu with E°cell = 1.1 V, if the external opposing potential is more than 1.1 V, the electrons flow from Cu to Zn.
Reason (R): The cell acts like a galvanic cell.
Now, let’s evaluate:
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Assertion (A) is incorrect. In a Daniell cell, when the external opposing potential is more than the cell potential (E°cell = 1.1 V in this case), the cell operates in reverse. Electrons flow from the anode (Zn) to the cathode (Cu), which is the opposite direction compared to the normal operation. This means that electrons flow from Zn to Cu, not from Cu to Zn as mentioned in the assertion.
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Reason (R) is partially correct. The Daniell cell does indeed act like a galvanic cell, where chemical energy is converted into electrical energy. However, the assertion doesn’t accurately represent the behavior of the cell in reverse when the opposing potential is greater than the cell potential.
Therefore, Assertion (A) is incorrect, but Reason (R) is partially correct.
