Multiple Choice
What is the correct name for the compound with the formula NH_4NO_2?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the compound with the formula CrPO_4?
A
Chromium(II) phosphate
B
Chromium(III) phosphate
C
Chromium(I) phosphate
D
Chromium phosphate
Verified step by step guidance1
Identify the ions present in the compound CrPO_4. The compound consists of the chromium cation (Cr) and the phosphate anion (PO_4^{3-}).
Determine the charge on the phosphate ion, which is known to be 3- (PO_4^{3-}).
Since the compound is neutral overall, the total positive charge from chromium must balance the 3- charge from phosphate. Therefore, the chromium ion must have a charge of 3+.
Use the charge on the chromium ion to write the correct name using the Stock system, which indicates the oxidation state of the metal in Roman numerals. Here, chromium has a +3 charge, so it is Chromium(III).
Combine the name of the cation with the name of the anion to get the full name: Chromium(III) phosphate.
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