Which is the correct name for the compound Mn(NO3)2?

• A. manganese nitride
• B. manganese nitrate
• C. manganese(II) nitrate
• D. manganese(IV) nitrate

Answer: (C)

Verified step by step guidance

1. Identify the cation and anion in the compound Mn(NO3)2. Here, Mn is the metal cation (manganese), and NO3 is the nitrate polyatomic ion.
2. Determine the charge on the nitrate ion. The nitrate ion (NO3) has a charge of -1.
3. Since there are two nitrate ions, the total negative charge is 2 × (-1) = -2. To balance this, the manganese cation must have a charge of +2.
4. Name the cation with its oxidation state in Roman numerals in parentheses. Since manganese has a +2 charge here, it is named manganese(II).
5. Combine the cation and anion names to form the full name: manganese(II) nitrate.