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Question

Assertion (A): The ionization of hydrogen sulfide in water is low in the presence of hydrochloric acid.

Reason I: Hydrogen sulphide is a weak acid


A

Both A and R are true but R is not the correct explanation of A.

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B

Both A and R are true and R is the correct explanation of A.

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C

A is true but R is false.

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D

A is false but R is true.

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Solution

The correct option is A

Both A and R are true but R is not the correct explanation of A.


Analyzing the assertion

The ionization of H2S in water is low in the presence of HCl. Yes, it is correct statement. It occurs because of common Ion effect.

Analyzing the reason

H2S is weak acid,

Yes, it is correct statement too.

But this is not a correct explanation of given A because the low ionization of H2S (weak acid) in presence of HCl (strong acid) is due to the presence of common ion effect because of H+ ion.

HClH++Cl

H2SH++HS
Hence, Both assertion and reason are true but reason is not the correct explanation of assertion

Correct answer is option (B).


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