Consider the following statementsa) The pH of a mixture containin

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 Multiple Choice QuestionsMultiple Choice Questions

431.

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


432.

For the following reactions, equilibrium constans are given:

S(s) + O2(g) SO2(g); K1 = 1052

2S(s) + 3O2(g) ⇌ 2SO3(g); K2 = 10129

The equilibrium constant for the reaction,

2SO2(s) + O2(g) ⇌ 2SO3(g)

  • 10181

  • 1077

  • 10154

  • 1025


433.

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)


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434.

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


C.

a,b, and c

H2SO4 + NaOH   H+ +       OH  OHI = 400×0.1          400×0.1  = 80 meq            = 40 meqF= 40 meq           0 H+= 40800= 120 pH= -log120= log2+ log10= 13


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435.

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

  • 5.35

  • 2.65

  • 4.65

  • 4.35


436.

For the reaction, 2SO2(g) + O2(g) 2SO3(g), ΔH= -57. 2kJ mol-1 and Kc = 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


437.

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

  • Internal energy

  • Enthalpy

  • Activation energy

  • Activation energy

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438.

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

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439.

MY and NY3, two nearly insoluble salts. have the same Ksp 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.

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440.

Consider the following liquid-vapour equilibrium

Liquid space rightwards harpoon over leftwards harpoon space Vapour
Which of the following relations is correct?

  • dlnP over dT equals fraction numerator negative increment H subscript v over denominator R T end fraction
  • dlnP over dT squared space equals space fraction numerator negative increment straight H subscript straight v over denominator straight T squared end fraction
  • dlnP over dT space equals space fraction numerator negative increment straight H subscript straight v over denominator RT squared end fraction
  • dlnP over dT space equals space fraction numerator negative increment straight H subscript straight v over denominator RT squared end fraction
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