The correct option for the chemical name of the compound CuCO\(_{3}\) is **B. Copper (ii) carbonate**. ### Step-by-Step Explanation: 1. **Understanding the Components of the Compound**: - The formula CuCO\(_{3}\) consists of two parts: Cu and CO\(_{3}\). - Cu represents copper, which is a transition metal that can have multiple oxidation states. - CO\(_{3}\) is the carbonate ion, which has a charge of -2. 2. **Determining the Oxidation State of Copper**: - In order to balance the overall charge of the compound, we need to determine the oxidation state of copper (Cu). - The carbonate ion (CO\(_{3}^{2-}\)) has a charge of -2. To balance this, the copper must have a charge of +2. - Therefore, the oxidation state of copper in CuCO\(_{3}\) is +2. 3. **Naming the Compound**: - When naming compounds, the oxidation state of the metal is indicated in parentheses after the name of the metal. - Since copper has an oxidation state of +2 in this compound, it is named "Copper (ii)". - The anion (in this case, carbonate) is named as is, so we combine these to get "Copper (ii) carbonate". ### Why the Other Options are Incorrect: - **A. Copper (iii) carbonate**: - This option suggests that copper has an oxidation state of +3. However, in CuCO\(_{3}\), copper is +2, not +3. Therefore, this option is incorrect. - **C. Copper (i) carbonate**: - This option indicates that copper has an oxidation state of +1. Again, this is incorrect because the oxidation state of copper in CuCO\(_{3}\) is +2, not +1. - **D. Copper**: - This option is incomplete as it does not specify the oxidation state of copper. The name of the compound must include the oxidation state to be accurate. Therefore, this option is also incorrect. ### Summary of Key Points: - The compound CuCO\(_{3}\) is named Copper (ii) carbonate because: - Copper has an oxidation state of +2 in this compound. - The carbonate ion (CO\(_{3}^{2-}\)) has a charge of -2, balancing the +2 charge from copper. - The correct naming convention requires specifying the oxidation state of the metal. - Other options are incorrect due to misrepresentation of copper's oxidation state or lack of specificity. ### Revision Summary: - CuCO\(_{3}\) is Copper (ii) carbonate. - Copper has an oxidation state of +2 in this compound. - The carbonate ion has a charge of -2. - Always specify the oxidation state when naming transition metal compounds.