In a galvanic cell which is wrong?

Reduction takes place at the anode

The correct answer is option 3. Reduction takes place at anode.

In a galvanic cell, the conversion of chemical energy into electrical energy occurs through a spontaneous redox reaction. Let's break down each statement and explain why they are true or false:

1. Anode is negative polarity:

The statement is true. The anode is where oxidation occurs. During oxidation, electrons are released by the anode into the external circuit. These electrons flow from the anode to the cathode, providing the electrical current. Since electrons flow out of the anode, it becomes negatively charged.

2. Cathode has positive polarity:

The statement is true. The cathode is where reduction occurs. Reduction involves the gain of electrons. Electrons from the external circuit are accepted by the cathode. As a result, the cathode becomes positively charged.

3. Reduction takes place at the anode:

The statement is false. In a galvanic cell, oxidation occurs at the anode, not reduction. Oxidation involves the loss of electrons. At the anode, the substance being oxidized loses electrons and undergoes oxidation. The released electrons flow through the external circuit to the cathode.

4. Reduction takes place at cathode:

The statement is true. Reduction occurs at the cathode in a galvanic cell. Reduction involves the gain of electrons. At the cathode, electrons from the external circuit are accepted by the substance undergoing reduction. This process results in a reduction of charge or oxidation state of the substance.

The key to understanding these statements lies in the processes of oxidation and reduction. Oxidation occurs at the anode (releasing electrons) and reduction occurs at the cathode (accepting electrons). The polarity of the electrodes is a consequence of these processes. Therefore, the statements about the polarity of the electrodes are true, while the statement about reduction occurring at the anode is false.