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

Cabonate

Step-by-step 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^-`