Question

3cu²⁺ + 2cr → 2cr³⁺ + 3cu in the voltaic cell above, which letter represents the cathode half - cell? enter the answer choice letter.

Explanation:

In a voltaic cell, the cathode is where reduction occurs. The given reaction is \(3\text{Cu}^{2+}+2\text{Cr}
ightarrow2\text{Cr}^{3+}+3\text{Cu}\). Here, \(\text{Cu}^{2+}\) gains electrons (is reduced) to form \(\text{Cu}\). The half - cell with \(\text{Cu}/\text{Cu}^{2+}\) (labeled A) is where the reduction of \(\text{Cu}^{2+}\) takes place, so it is the cathode half - cell.

Answer:

A