Which compound contains the carbonate ion?

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Multiple Choice

Which compound contains the carbonate ion?

Explanation:
The key idea is recognizing the carbonate ion, CO3 2-. It’s a polyatomic ion with three oxygens around a central carbon and carries a 2− charge. In salts, it pairs with metal ions to balance that charge. Among the options, the one that contains the carbonate ion is the salt that includes CO3 2− together with potassium ions (two K+ to balance the 2− charge). The other compounds contain sulfate (SO4 2−), nitrate (NO3−), and a combination of ammonium and hydroxide, not carbonate. So potassium carbonate is the compound that contains the carbonate ion.

The key idea is recognizing the carbonate ion, CO3 2-. It’s a polyatomic ion with three oxygens around a central carbon and carries a 2− charge. In salts, it pairs with metal ions to balance that charge. Among the options, the one that contains the carbonate ion is the salt that includes CO3 2− together with potassium ions (two K+ to balance the 2− charge). The other compounds contain sulfate (SO4 2−), nitrate (NO3−), and a combination of ammonium and hydroxide, not carbonate. So potassium carbonate is the compound that contains the carbonate ion.

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