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. From the reaction \(3\text{Cu}^{2+}+2\text{Cr}
ightarrow2\text{Cr}^{3+}+3\text{Cu}\), \(\text{Cu}^{2+}\) gains electrons (is reduced) to form \(\text{Cu}\). The half - cell with \(\text{Cu}/\text{Cu}^{2+}\) is where this reduction happens, and that half - cell is labeled A.

Answer:

A