Multiple Choice
Which of the following is the correct name for the compound NaBr?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct IUPAC name for the compound CoCl2?
A
Cobalt dichloride
B
Cobalt chloride
C
Cobalt(III) chloride
D
Cobalt(II) chloride
Verified step by step guidance1
Identify the metal and the ligands in the compound. Here, the metal is cobalt (Co) and the ligands are chloride ions (Cl).
Determine the oxidation state of the metal. Since each chloride ion has a charge of -1 and there are two chloride ions, the total negative charge is -2. To balance this, cobalt must have a +2 charge, so its oxidation state is +2.
Apply the IUPAC naming convention for transition metal compounds: write the name of the metal first, followed by its oxidation state in Roman numerals in parentheses, then the name of the anion with the suffix '-ide'.
Combine the parts: the metal name is 'Cobalt', the oxidation state is '(II)', and the anion is 'chloride'.
Thus, the correct IUPAC name is 'Cobalt(II) chloride'.
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