Multiple Choice
Which of the following is the correct chemical formula for manganese(II) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for ammonium fluoride?
A
NH4F
B
NH4O
C
NH3F
D
NH4Cl
Verified step by step guidance1
Identify the ammonium ion, which is a polyatomic ion with the formula $\mathrm{NH_4^+}$.
Recognize that fluoride is the anion derived from fluorine, with the formula $\mathrm{F^-}$.
Combine the ammonium cation $\mathrm{NH_4^+}$ with the fluoride anion $\mathrm{F^-}$ to form a neutral compound.
Since the charges of $\mathrm{NH_4^+}$ and $\mathrm{F^-}$ balance each other one-to-one, the chemical formula is simply $\mathrm{NH_4F}$.
Verify that the other options do not correctly represent ammonium fluoride: $\mathrm{NH_4O}$ (ammonium oxide), $\mathrm{NH_3F}$ (incorrect formula), and $\mathrm{NH_4Cl}$ (ammonium chloride).
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