Ionic reactions and ion testsHigh frequency

• A.It must contain $\mathrm{NH_4^+}$, $\mathrm{CO_3^{2-}}$ and $\mathrm{Na^+}$
• B.It must contain $\mathrm{NH_4^+}$ and $\mathrm{CO_3^{2-}}$, and contains no $\mathrm{Cu^{2+}}$ or $\mathrm{SO_4^{2-}}$
• C.It must contain $\mathrm{NH_4^+}$, $\mathrm{CO_3^{2-}}$ and $\mathrm{SO_4^{2-}}$
• D.It must contain $\mathrm{NH_4^+}$ and $\mathrm{CO_3^{2-}}$, and contains no $\mathrm{Cl^-}$

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