What is the chemical name for CuCl?

The chemical name for CuCl is Copper(I) chloride. This naming is based on the oxidation state of the copper ion in this compound. Copper can have multiple oxidation states, primarily +1 and +2. In the case of CuCl, since there is one chloride ion (Cl⁻, which has a -1 charge), the copper must have a +1 charge to balance the overall charge of the compound to zero. Therefore, it is named using the Roman numeral I to indicate the +1 oxidation state, resulting in the name Copper(I) chloride.

The other choices reflect different compounds or oxidation states of copper. Copper(II) chloride would be represented by CuCl₂, which involves copper in the +2 oxidation state. Copper sulfate refers to CuSO₄ and involves sulfate ions, while Copper oxide would typically refer to CuO or Cu₂O, which involve copper with oxygen, highlighting different compounds entirely.