QQuestionChemistry
QuestionChemistry
"Which formula/name pair is incorrect?
A. Mn(NO₃)₂ - manganese(II) nitrate
B. Mg(NO₃)₂ - magnesium nitrate
C. Mg₃N₂ - magnesium nitrite
D. Mn(NO₂)₂ - manganese(II) nitrite
E. Mg(MnO₄)₂ - magnesium permanganate"
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Answer
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Step 1: Identify the incorrect formula-name pair.
The incorrect formula-name pair is Option C: Mg₃N₂ - magnesium nitrite. This is incorrect because Mg₃N₂ is magnesium nitride, not nitrite.
Step 2: Explain the error in Option C.
Nitride (N²-) and nitrite (NO₂-) are different ionic species. Nitride is a negative ion with one nitrogen atom, while nitrite is a negative ion with one nitrogen atom bonded to two oxygen atoms. Therefore, the formula Mg₃N₂ represents a compound containing magnesium and nitride ions, not nitrite ions.
Final Answer
- The incorrect formula-name pair is Option C: Mg₃N₂ - magnesium nitrite. The correct formula for magnesium nitrite is Mg(NO₂)₂.
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