Question

1- Calcium Hydroxide + Calcium Bicarbonate

2- Calcium Bicarbonate + Sodium Carbonate

3- Calcium Sulphate + Sodium Carbonate

4- Sodium compound + Calcium Sulphate

5- Carbon dioxide + Calcium Carbonate

6- Calcium Bicarbonate + Calcium Carbonate​

Answer 1

Remember these followings :-

Acid + Base = salt + water

Acid + metal = salt + hydrogen

Acid + carbonates = salt + water + carbon dioxide

Base + ammonium salt = salt + ammonia + water

Base + acidic oxide = salt + water

I hope that you will be clear via these formulas.