Multiple Choice
Which of the following is the correct chemical formula for iron(III) sulfide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following anions would bond with K^+ in a 1:1 ratio to form a neutral ionic compound?
A
PO_4^{3-}
B
SO_4^{2-}
C
Cl^-
D
O^{2-}
Verified step by step guidance1
Identify the charge on the potassium ion, K^+, which is +1.
Examine each anion's charge to determine the ratio needed to balance the positive charge of K^+ to form a neutral compound:
For PO_4^{3-}, the phosphate ion has a charge of -3, so 3 K^+ ions would be needed to balance one PO_4^{3-} ion, resulting in a 3:1 ratio, not 1:1.
For SO_4^{2-}, the sulfate ion has a charge of -2, so 2 K^+ ions would be needed to balance one SO_4^{2-} ion, resulting in a 2:1 ratio, not 1:1.
For Cl^-, the chloride ion has a charge of -1, which balances exactly with one K^+ ion, giving a 1:1 ratio and forming a neutral ionic compound.
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