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Ionic Equilibrium question

2022 · 25 Jun · Shift 2 · Q6
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Ionic Equilibrium question

2022 · 25 Jun · Shift 2 · Q6

JEE MainChemistryIonic EquilibriumMCQ+4 / −1
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 NH3NH_3NH3​ and as a base with H2SH_2SH2​S. In the light of the above statements choose the correct answer from the options given below :
  1. A
    Both A and R are true and R is the correct explanation of A.
  2. B
    Both A and R are true but R is NOT the correct explanation of A.
  3. C
    A is true but R is false.
  4. D
    A is false but R is true.
View written solutionFree

Correct answer: D

  1. Check Assertion A

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

    • Amphoteric nature means a substance can act as both an acid and a base.
    • For water, this is most naturally explained by the Brønsted–Lowry concept:
      • As an acid, water can donate a proton: H2O+NH3→NH4++OH−H_2O + NH_3 \rightarrow NH_4^+ + OH^-H2​O+NH3​→NH4+​+OH−
      • As a base, water can accept a proton: H2O+H2S⇌H3O++HS−H_2O + H_2S \rightleftharpoons H_3O^+ + HS^-H2​O+H2​S⇌H3​O++HS−
    • The Lewis concept deals with electron-pair acceptance/donation, and while many acid-base behaviors can be described that way, the amphoteric behavior of water in this context is specifically explained more appropriately by proton donation/acceptance.

    Therefore, Assertion A is false.

  2. Check Reason R

    Reason: Water acts as an acid with NH3NH_3NH3​ and as a base with H2SH_2SH2​S.

    • With ammonia: NH3+H2O⇌NH4++OH−NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-NH3​+H2​O⇌NH4+​+OH− Water donates a proton, so it acts as an acid.

    • With hydrogen sulfide: H2S+H2O⇌HS−+H3O+H_2S + H_2O \rightleftharpoons HS^- + H_3O^+H2​S+H2​O⇌HS−+H3​O+ Water accepts a proton, so it acts as a base.

    Therefore, Reason R is true.

  3. Select the correct option

    • Assertion A: False
    • Reason R: True

    Hence, the correct option is: D\boxed{\text{D}}D​

  4. Compare with stored correct answer

    Stored correct answer = D

    My derived answer = D

    So, they agree.

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