In the following compounds, the decreasing order of basic strength will be:

• (C₂H₅)₂NH > NH₃ > C₂H₅NH₂

• (C₂H₅)₂NH > C₂H₅NH₂ > NH₃

• C₂H₅NH₂ > NH₃ > (C₂H₅)₂NH

• NH₃ > C₂H₅NH₂ > (C₂H₅)₂NH

For the following reactions, equilibrium constans are given:

S(s) + O₂(g) $\rightleftharpoons$SO₂(g); K₁ = 10⁵²

2S(s) + 3O₂(g) $\rightleftharpoons \; 2$SO₃(g); K₂ = 10¹²⁹

The equilibrium constant for the reaction,

2SO₂(s) + O₂(g) $\rightleftharpoons \; 2$SO₃(g)

• 10¹⁸¹

• 10⁷⁷

• 10¹⁵⁴

• 10²⁵

In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titration mixture in this experiment ?

• (D)

• (A)

• (C)

• (B)

Consider the following statements

a) The pH of a mixture containing 400mL of 0.1M H2SO4 and 400 mLof 0.1M NaOH will be approximately 1.3.

b) Ionic product of water is temperature dependent.

c) A monobasic acid with Ka=10^-5 has a pH=5. The degree of dissociation of this acid is 50%.

d) The Le Chatelier’s Principle is not applicable to common-ion effect.

The correct statements are

• b and c

• a,b and d

• a,b, and c

• a and b

The pH of a 0.02 M NH₄Cl solution will be: [ given K_b(NH₄OH) = 10^-5 and log 2= 0.301]

• 5.35

• 2.65

• 4.65

• 4.35

For the reaction, 2SO₂(g) + O₂(g) $\rightleftharpoons$2SO₃(g), ΔH= -57. 2kJ mol^-1 and K_c = 1.7 × 10⁶. Which of the following statement is INCORRECT ?

• The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required

• The equilibrium constant decreases as the temperature increases.

• The equilibrium will shift in forward direction as the pressure increase

• Volume will not affect the equilibrium constant

The addition of a catalyst during a chemical reaction alters which of the following quantities ?

• Internal energy

• Enthalpy

• Activation energy

• Activation energy

Which one of the following characteristics is associated with adsorption?

• ΔG, ΔH and  ΔS all are negative

• ΔG and  ΔH are negative but  ΔS is positive

• ΔG and  ΔS are negative but  ΔH is positive

• ΔG and  ΔS are negative but  ΔH is positive

MY and NY₃, two nearly insoluble salts. have the same K_sp values of 6.2 x 10^-13 at room temperature. Which  statement would be true in regard to MY and NY₃ ?

• The molar solubility of MY in water is less than that of NY₃

• The salts MY and NY₃ are more soluble in 0.5 M KY than in pure water

• The addition of the Salt of KY to the solution of MY and NY₃ will have no effect on their solubilities.

• The addition of the Salt of KY to the solution of MY and NY₃ will have no effect on their solubilities.

Consider the following liquid-vapour equilibrium


Which of the following relations is correct?