Multiple Choice
Which of the following ionic compounds is commonly used as a building material?
1
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3. Chemical Reactions
Naming Ionic Compounds
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Which one of the following compounds contains the nitrite ion?
A
Na_2SO_3
B
Na_2CO_3
C
NaNO_2
D
NaNO_3
Verified step by step guidance1
Identify the nitrite ion by its chemical formula. The nitrite ion is represented as $\mathrm{NO_2^-}$, which consists of one nitrogen atom and two oxygen atoms with an overall negative charge of one.
Examine each compound's formula to see if it contains the nitrite ion $\mathrm{NO_2^-}$. For example, $\mathrm{Na_2SO_3}$ contains the sulfite ion $\mathrm{SO_3^{2-}}$, and $\mathrm{Na_2CO_3}$ contains the carbonate ion $\mathrm{CO_3^{2-}}$.
Look at $\mathrm{NaNO_2}$, which contains sodium ($\mathrm{Na^+}$) and the $\mathrm{NO_2^-}$ ion, matching the nitrite ion formula.
Check $\mathrm{NaNO_3}$, which contains the nitrate ion $\mathrm{NO_3^-}$, different from the nitrite ion because it has three oxygen atoms instead of two.
Conclude that the compound containing the nitrite ion $\mathrm{NO_2^-}$ is $\mathrm{NaNO_2}$.
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