Question

Assertion: Aquatic species are more comfortable in warm water than cold water.
Reason: ${{K}_{H}}$ values for both ${{N}_{2}}$ and ${{O}_{2}}$ decreases with the increase of temperature.
(a)- Both the assertion and the reason are correct and the reason is the correct explanation for the assertion.
(b)- Both the assertion and the reason are correct but the reason is not the correct explanation for the Assertion.
(c)- Assertion is correct but the reason is incorrect.
(d)- Both the assertion and reason are incorrect.

Answer 1

Hint: The aquatic life gets oxygen dissolved from the water and the solubility of the oxygen in the water increases as the temperature of the water decreases. ${{K}_{H}}$ is henry’s constant.

Complete step-by-step answer:All the animals require oxygen for respiration which is an essential process in the body. So, the animals living on the land get the oxygen from the air, but the animals living inside the water, i.e., aquatic animals have only water to get the oxygen.
So, the dissolution of the oxygen in water depends on the water because water is a liquid and oxygen is a gas. The solubility of the gas depends on the temperature of the liquid.
As the temperature of the liquid increases, the solubility of the gas decreases. So, we can say that at high temperatures, the amount of oxygen in the water will be low.
This means the aquatic life will be more comfortable in cold water than warm water.
Since the solubility is inversely proportional to the temperature of the liquid, and the henry constant is inversely proportional to the solubility. So, as the temperature increases the henry’s constant will also increase.
Therefore, according to the above discussion, both the assertion and the reason are incorrect.

Hence, the correct answer is an option (d).

Note: The aquatic life near the thermal power plant destroys easily because the thermal power plant uses the cold water from the source, uses it, and then throws the hot water into the same source which will destroy the aquatic life.