Multiple Choice
Which of the following is the correct chemical formula for cobalt(II) iodide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for manganese(II) sulfide?
A
MnSO4
B
MnS2
C
Mn2S3
D
MnS
Verified step by step guidance1
Identify the oxidation state of manganese in manganese(II) sulfide. The Roman numeral II indicates that manganese has a +2 charge, written as Mn^{2+}.
Determine the charge of the sulfide ion. Sulfide is the anion of sulfur with a charge of -2, written as S^{2-}.
Combine the ions in a ratio that results in a neutral compound. Since Mn^{2+} and S^{2-} have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.
Write the chemical formula by placing the symbols of manganese and sulfide together with their respective subscripts indicating the number of atoms. Since the ratio is 1:1, no subscripts are needed, resulting in MnS.
Verify that the formula is electrically neutral by confirming that the total positive charge balances the total negative charge.
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