Answer:
First figure
Explanation:
The chemical formula of carbonic acid is H₂CO₃. It consists of a carboxyl group which is connected with two hydroxyl groups. It is a weak acid which forms two salts carbonates and bicarbonates. The black color denotes carbon (C), the red color denotes oxygen (O), and the white color denotes hydrogen (H).
The first figure show 3 red balls which means 3 oxygen, 1 black ball which means 1 carbon and 2 white balls which means 2 hydrogen.
