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NEETChemistryChemical Equilibrium

Given below are two statements; one is labelled as Assertion (A) and the other is labelled as Reason(R). Assertion (A) : Solubility of a gas in water decreases with increase in temperature. Reason (R) : Dissolution of a gas in water is an exothermic process. In the light of the above statements, choose the most appropriate answer from the options given below :

Options

  1. ABoth (A) and (R) are correct but (R) is not the correct explanation of (A).
  2. B(A) is correct but (R) is not correct.
  3. C(A) is not correct but (R) is correct.
  4. DBoth (A) and (R) are correct and (R) is the correct explanation of (A).

Correct answer

D. Both (A) and (R) are correct and (R) is the correct explanation of (A).

Step-by-step solution

- Assertion (A): Solubility of a gas in water decreases with increase in temperature. Correct. Most gases dissolve in water exothermically. According to Le Chatelier's principle, increasing temperature shifts equilibrium in the opposite direction (less dissolution), hence solubility decreases. - Reason (R): Dissolution of a gas in water is an exothermic process. Correct. Heat is released when gas molecules are captured by water molecules (due to intermolecular attractions). Here, (R) correctly explains (A) ( ) high

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