Which of the following statements is not correct?

The correct answer is Option (3) → In a Daniell cell, the passage of electricity inside the cell occurs from Cu to Zn

In a Daniell cell, zinc is oxidised (anode) and \( \ce{Cu^2+} \) is reduced (cathode). In the external circuit electrons flow from Zn to Cu, so the current flows from Cu to Zn. The circuit is closed, so inside the cell (through the solutions and the salt bridge) the current flows the other way, from Zn to Cu.

Option (1) In a galvanic cell, chemical energy is converted into electrical energy — A correct statement. A galvanic cell converts the chemical energy of a spontaneous redox reaction into electrical energy.

Option (2) In a voltaic cell, electrical energy is produced due to an oxidation-reduction reaction — A correct statement. A voltaic cell is another name for a galvanic cell; its electricity comes from a redox reaction.

Option (3) In a Daniell cell, the passage of electricity inside the cell occurs from Cu to Zn — A statement that is not correct. Cu to Zn is the current direction in the external circuit; inside the cell it is from Zn to Cu.

Option (4) In an electrochemical cell, the electrons flow from the anode to the cathode in the external circuit — A correct statement. Electrons leave the negative anode and travel through the wire to the positive cathode.

NCERT (2026-27 edition):
Fig. 2.2: Functioning of Daniell cell when external voltage E_ext opposing the cell potential is applied – “When E_ext < 1.1 V (i) Electrons flow from Zn rod to Cu rod hence current flows from Cu to Zn.”

2.2 Galvanic Cells – “… Thus, there exists a potential difference between the two electrodes and as soon as the switch is in the on position the electrons flow from negative electrode to positive electrode. The direction of current flow is opposite to that of electron flow.”