Verified Solution • 2025–26 Session moderate

QJEEM22Ch9659: JEE Main 2022 Chemistry - Class 11 JEEM22Ch9659 Solution: Given below are two statements one is labelled as Assertion A…

Given below are two statements one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : The amphoteric nature of water is explained by using Lewis acid/base concept.

Reason R : Water acts as an acid with NH3 and as a base with H2S.

In the light of the above statements choose the correct answer from the options given below :

Multiple Choice Options

  • A Both A and R are true and R is the correct explanation of A.
  • B Both A and R are true but R is NOT the correct explanation of A.
  • C A is true but R is false.
  • D A is false but R is true.

Step-by-Step Verified Solution

The amphoteric nature of water is explained by using Bronsted-Lowry acid base concept

H2O (acid) +NH3⇌OH−+NH4+\underset{\text { (acid) }}{\mathrm{H}_{2} \mathrm{O}}+\mathrm{NH}_{3} \rightleftharpoons \mathrm{OH}^{-}+\mathrm{NH}_{4}^{+}

H2O (base) +H2 S⇌H3O++HS−\underset{\text { (base) }}{\mathrm{H}_{2} \mathrm{O}}+\mathrm{H}_{2} \mathrm{~S} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{HS}^{-}

Hence, A is false but R is true

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