AIIMS 2017 Chemistry Ionization Assertion Reason Question
In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choice.
Assertion (A) Theionisation of hydrogen sulphide in water is low in the presence of HCl.
Reason (R) is a weak acid.
Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
Assertion is correct but Reason is incorrect.
Both Assertion and Reason are incorrect.
Correct Answer
Detailed Explanation
Option C is correct because the assertion that the ionization of hydrogen sulfide (H₂S) in water is low in the presence of hydrochloric acid (HCl) is true, as the added HCl increases the concentration of H⁺ ions, shifting the equilibrium of the H₂S ionization reaction to the left. However, the reason stating that H₂S is a weak acid does not directly explain why its ionization is low in HCl, making the reason insufficient as an explanation for the assertion.
Option A is incorrect because it claims the reason is a correct explanation, which it is not. Option B incorrectly states that the reason explains the assertion, while option D is wrong as both statements are indeed true.
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