Question

$C{{O}_{2}}$ dissolves in water to form
A. $C{{O}_{2}}$
B. Carbonic acid
C. $C{{H}_{4}}$
D. ${{O}_{2}}$

Answer 1

Hint:In this question we should note that dissolved carbon dioxide is used by the aquatic and marine plants along with other raw materials to prepare their own food. but one should remember that all carbon dioxide does not dissolve in water.

Complete step-by-step answer:Dissolved oxygen and dissolved carbon dioxide are essential for the marine plants. It is important to note that carbon dioxide is one of the most important gases that dissolves in the ocean. Some of it stays as dissolved gas, but most react with the water to form carbonic acid or react with carbonates already in the water to form bicarbonates. This removes dissolved carbon dioxide from the water. Carbon dioxide is soluble in water in which it forms the carbonic acid ${{H}_{2}}C{{O}_{3}}$which is a weak acid. The complete reaction is shown below,
$C{{O}_{2}}\,+\,{{H}_{2}}O\, \to {{H}_{2}}C{{O}_{3}}$
Hence, we can conclude that carbon dioxide dissolves in the water to form carbonic acid.
We should note here that the ocean has an enormous carbon sink and has taken up a third of the carbon dioxide. And one important factor that we should focus on is that gas solubility decreases as the temperature of the water increases.

Hence, the correct option is B, carbonic acid.

Note: We should here note that the increase in concentration of carbon dioxide in the atmosphere, increases the uptake of carbon dioxide into the oceans which causes a miserable decrease in the Ph of the oceans, which is referred to as ocean acidification.