Multiple Choice
Which of the following is the correct chemical formula for mercury(II) nitride?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for cobalt(II) chromate?
A
Co2(CrO4)3
B
Co(Cr2O7)
C
CoCrO4
D
Co2CrO4
Verified step by step guidance1
Identify the oxidation states of the ions involved: Cobalt(II) means cobalt has a +2 charge, written as Co^{2+}. The chromate ion is CrO_4^{2-}, which has a -2 charge.
Write the formula for each ion separately: Co^{2+} and CrO_4^{2-}.
Determine the ratio of ions needed to balance the overall charge. Since both ions have charges of magnitude 2 but opposite signs, one Co^{2+} ion will balance one CrO_4^{2-} ion.
Combine the ions in a 1:1 ratio to form a neutral compound, resulting in the formula CoCrO_4.
Verify that the total positive charge equals the total negative charge to confirm the formula is electrically neutral.
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