661.

Which of the following is strongest Bronsted base?

• ClO-

• ClO₂^-

• ClO₃^-

• ClO₄^-

When the temperature of reactions will increase then the effect on pH value will

• increase

• decrease

• first increases then decreases

• remains same.

Consider the following salts : NaCl, HgCl₂, Hg₂Cl₂, CuCl₂, CuCl and AgCl. Identify the correct set of insoluble salts in water.

• Hg₂Cl₂, CuCl, AgCl

• Hg₂Cl, CuCl, AgCl

• Hg₂Cl₂, CuCl₂, AgCl

• Hg₂Cl₂, CuCl, NaCl

The pH of aqueous solution ofammonium formate is (pK_a of HCOOH = 3.8 and pK_b of NH₃= 4.8)

• 7

• 6.0

• 6.5

• 8.9

The pH value of decinormal solution of NH₄OH which is 20% ionised is

• 12.95

• 12.30

• 14.70

• 13.30

For the reaction,
2SO₂ (g) + O₂ (g) $\rightleftharpoons$ 2SO₃ (g) at 300 K, the value of $∆$G° is -690.9 R. The equilibrium constant value for the reaction at that temperature is (R is gas constant)

• 10 atm^-1

• 10 atm

• 10

• 1

In which of the following reaction K_p> K_c ?

• ${\mathrm{PCl}}_3 + {\mathrm{Cl}}_3 \to {\mathrm{PCl}}_5$

• ${\mathrm{H}}_2+{\mathrm{I}}_2 \to 2\mathrm{HI}$

• $2{\mathrm{SO}}_3 \to {\mathrm{O}}_2 + 2{\mathrm{SO}}_2$

• ${\mathrm{N}}_2+ 3{\mathrm{H}}_2 \to 2{\mathrm{NH}}_3$

The ratio of volumes of CH₃COOH 0.1 (N) to CH₃COONa 0.1 (N) required to prepare a buffer solution of pH 5.74 is (Given pK_a of CH₃COOH is 4.74)

• 10 : 1

• 5 : 1

• 1 : 5

• 1 : 10

Which of the following is a characteristic of a reversible reaction?

• It never proceeds to completion

• It can be influenced by a catalyst

• It proceeds only in forward direction

• Number of moles of reactants and products are equal.

The equilibrium constant of a reaction is 300. If the volume of a reaction flask is trippled, the equilibrium constant will be

• 300

• 100

• 600

• 150