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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^-

385.
Which of the following is not a equilibrium ?

Ice $⇌$ Water

I₂(s) $⇌$ I₂(g)

S (l) $⇌$ S (g)

3O₂ $⇌$ 2O₃

3O₂ $⇌$ 2O₃

When a compound or element exists in different phases (states), a physical equilibrium exists between them.

$(a) \underset{(solid state of H_{2} O)}{Ice} ⇌ \underset{(liquid state of H_{2} O)}{Water} (physical equilibrium) (b) I_{2} (s) ⇌ I_{2} (g) (physical equilibrium) (c) S (l) ⇌ S (g) (physical equilibrium) (d) 3 O_{2} (g) ⇌ 2 O_{3} (g)$

O₂ and O₃ are the allotropes of oxygen, ie, have different composition, so the equilibrium exist between them is considered as chemical equilibrium.

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)