Question

What polyatomic ion forms a neutral compound when combined with a group 2A monatomic ion in a 1:1 ratio?
• ammonium
• carbonate
• nitrate
• phosphate

Answer 1

It's B. Carbonate hope this helps

Answer 2

Answer:

Cabonate

Explanation:

Hi, this are the ions you listed:

Ammonium: $NH_4^+$

Carbonate: $CO_3^{-2}$

Nitrate: $NO_3^-$

Phosphate: $PO_4^{-3}$

All group 2A compounds (like Ca, Mg) have a valence number of +2. So:

• They don't bond with ammonium because they are both +
• With Cabonate they make neutral 1:1 compound: $Ca^{+2}CO_3^{-2} \longrightarrow CaCO_3$

• With Nitrate they make positive 1:1 compound: $Ca^{+2}NO_3^- \longrightarrow CaNO_3^+$

• With Phosphate they make negative 1:1 compound: $Ca^{+2}PO_4^{-3} \longrightarrow CaPO_4^-$