Multiple Choice
Which of the following statements about naming ionic compounds is correct?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for nickel(III) oxide?
A
NiO3
B
Ni3O
C
Ni2O3
D
NiO
Verified step by step guidance1
Identify the oxidation state of nickel in nickel(III) oxide. The (III) indicates that nickel has a +3 charge, or Ni^{3+}.
Determine the charge of the oxide ion. Oxygen typically forms an oxide ion with a charge of -2, or O^{2-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
Set up the ratio of nickel ions to oxide ions such that the total positive charge equals the total negative charge: \( 3 \times x = 2 \times y \), where x and y are the subscripts for Ni and O respectively.
Solve for the smallest whole number ratio that balances the charges, which leads to the formula \( \mathrm{Ni}_2\mathrm{O}_3 \).
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