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JEE Main 202225 JuneEvening Shift
Exam
JEE Main
Year
2022
Date
25 June
Shift
Evening Shift
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2022 · 25 June · Evening Shift · Chemistry · Ionic Equilibrium

Assertion: The amphoteric behaviour of water is explained by Lewis...

Assertion: The amphoteric behaviour of water is explained by Lewis acid base theory

Reason: water acts as acid with NH3{NH}_{3} and base with H2S{H}_{2}S

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
  3. CAssertion is true but Reason is false.
  4. DAssertion is false but Reason is true.

Correct answer

D. Assertion is false but Reason is true.

Step-by-step solution

H2O⏟Acid+N¨H3⏟Base→OH−+NH4+\mathop{\mathop{{H}_{2}O}_{⏟}}_{Acid} + \mathop{\mathop{\overset{¨}{N}{H}_{3}}_{⏟}}_{Base} \to OH - + {NH}_{4}^{+}

H2O⏟Base+H2SAcid⟶H3O++HS⊖\mathop{\mathop{{H}_{2}O}_{⏟}}_{Base} + \mathop{{H}_{2}S}_{Acid} ⟶ {H}_{3}{O}^{+} + {HS}^{⊖}

The amphoteric behaviour of H2O{H}_{2}O is explained by Brønsted theory not the Lewis acid base theory.

So, we can say Assertion is false, but reason is true.

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