In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will:

• also be doubled

• be halved

• remains the same

• becomes one-fourth

1012.

The equivalent weight of K₂Cr₂O₇ in acidic medium is expressed in terms of its molecular weight (M) as:

• M/3

• M/4

• M/6

• M/7

20 mL 0.1 (N) acetic acid is mixed with 10 ml  0.l(N) solution of NaOH. The pH of the resulting solution is (pK_b of acetic acid is 4.74)

• 3.74

• 4.74

• 5.74

• 6.74

The pH of 10^-4M KOH solution will be

• 4

• 11

• 10.5

• 10

The pH of an aqueous solution of CH₃COONa of concentration C(M) is given by:

• 7 - 1/2 pK_a - 1/2 log C

• 1/2 pK_w + 1/2 pK_b + 1/2 log C

• 1/2 pK_w - 1/2 pK_b - 1/2 log C

• 1/2 pK_w - pK_a + 1/2 log C

If the equilibrium constants of the following equilibria,

SO₂ + 1/2O₂ $\to$ SO₃ and 2SO₃ $\to$ 2SO₂ + O₂

are given by K₁ and K₂ respectively, which of the following relations is correct?

• K₂ = (1/K₁)²

• K₁ = (1/K₃)³

• K₂ = (1/K₁)

• K₂ = (K₁)²

Which ofthese is least likely to act as a Lewis base?

• CO

• F^-

• BF₃

• PF₃

An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.0), glutamic acid (3.2) and arginine (10.7) buffered at pH 6. What is the fate of the three acids?

• Glutamic acid migrates to anode at pH 6. Arginine is present as a cation and migrates to the cathode. Alanine in a dipolar ion remains uniformly distributed in solution

• Glutamic acid migrates to cathode and others remain uniformly distributed in solution

• All three remain uniformly distributed in solution

• All three move to cathode

If the molecular wt. of Na₂S₂O₃ and I₂ are M₁ and M₂ respectively then what will be the equivalent weight of Na₂S₂O₃ and I₂ in the following reaction?

2S₂O₃^2- + I₂ $\to$ S₄O₆^2- + 2I^-

• M₁ , M₂

• M₁ , M₂/2

• 2M₁ , M₂

• M₁ , 2M₂

The solubility of Ca₃(PO₄)₂ in water is y mol/L. Its solubility product is:

• 6y⁴

• 36y⁴

• 64y⁵

• 108y⁵