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Equilibrium

Multiple Choice Questions

381.

A buffer solution is prepared by mixing 0.1 M ammonia and 1.0 M ammonium chloride. At 298 K, the pK_b of NH₄OH is 5.0. The pH of the buffer is

10.0
9.0
6.0
8.0

382.

Which of the following behaves as Lewis acid and not as Bronsted acid ?

HCl
H₂SO₄
HSO $_{3}^{-}$
SO₃

383.

Conjugate acid of HF $_{2}^{-}$ is

H⁺
HF
F $_{2}^{-}$
H₂F₂

384.
Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?

H₂SO₄ + H₂O → H₃O⁺+ HSO $_{4}^{-}$

H₂O + H₂O → H₃O⁺ + OH^-

H₂O + NH $_{2}^{-}$ → NH₃+ OH^-

H₂O + NH₃ → NH $_{4}^{+}$ + OH^-

H₂SO₄ + H₂O → H₃O⁺+ HSO $_{4}^{-}$

According to Bronsted-Lowry concept, bases are the substance which have a tendency to accept a proton.

$(a) \underset{acid}{H_{2} {SO}_{4}} + \underset{base}{H_{2} O} \to \underset{conjugate acid}{H_{3} O^{+}} + \underset{Conjugated base}{{HSO}_{4}^{-}} (b) \underset{acid}{H_{2} O} + \underset{base}{H_{2} O} \to \underset{conjugate acid}{H_{3} O^{+}} + \underset{Conjugated base}{{OH}^{-}} (c) \underset{acid}{H_{2} O} + \underset{base}{{NH}_{2}^{-}} \to \underset{conjugate acid}{{NH}_{3}} + \underset{Conjugated base}{{OH}^{-}} (d) \underset{acid}{H_{2} O} + \underset{base}{{NH}_{3}} \to \underset{conjugate acid}{{NH}_{4}^{+}} + \underset{Conjugated base}{{OH}^{-}}$

385.

Which of the following is not a equilibrium ?

Ice $⇌$ Water
I₂(s) $⇌$ I₂(g)
S (l) $⇌$ S (g)
3O₂ $⇌$ 2O₃

386.

The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol^-1)