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Assertion: The amount of oxygen dissolved in a river or lake decreases as the water temperature increases.
Reasoning: According to Henry's Law, the solubility of a gas in a liquid decreases with increasing temperature.
Both Assertion and Reasoning are true, and Reasoning is the correct explanation of the Assertion.
Both Assertion and Reasoning are true, but Reasoning is not the correct explanation of the Assertion.
Assertion is true, but Reasoning is false.
Assertion is false, but Reasoning is true.
Answers (1)
The Assertion states that the amount of oxygen dissolved in a river or lake decreases as the water temperature increases. This is true because according to Henry's Law, the solubility of a gas in a liquid decreases with increasing temperature. As the water temperature increases, the kinetic energy of the water molecules also increases, making it more difficult for gas molecules to dissolve in the water.
The Reasoning explains the Assertion correctly by stating the scientific principle behind it. Henry's Law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid and inversely proportional to the temperature of the liquid. As the temperature increases, the solubility of gases decreases, and the dissolved gas molecules tend to escape from the liquid, leading to a decrease in the amount of gas dissolved in the liquid.
Therefore, both the Assertion and Reasoning are true, and the Reasoning provides the correct scientific explanation for the Assertion. Hence, the correct answer is (a) Both Assertion and Reasoning are true, and Reasoning is the correct explanation of the Assertion.
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