JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Equilibrium

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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

NH_{3}

and as a base with

H_{2} S

.

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

(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.✓ Correct

Answer: (D)

Solution

The amphoteric nature of water is better explained by Brønsted-Lowry theory (proton donor/acceptor), not Lewis theory. However, water does act as an acid with

NH_{3}

(donating a proton to form

NH_{4}^{+}

) and as a base with

H_{2} S

(accepting a proton to form

H_{3} O^{+}

). Thus, A is false but R is true.

JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Single correct option

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JEE Main · 2022 · 25 Jun 2022 · Shift 2 · Equilibrium

Solution

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