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 Multiple Choice QuestionsMultiple Choice Questions

1.

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

  • Internal energy

  • Enthalpy

  • Activation energy

  • Activation energy

5107 Views

2.

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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3.

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.

2225 Views

4.

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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5.

If the value of an equilibrium constant ofr particular reaction is 1.6 x1012 then at equilibrium the system will contains

  • all reactants

  • mostly reactants

  • mostly products

  • mostly products

1313 Views

6.

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 x 10-12, 1.8 x 10-11, 8.3 x 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4

  • AgI

  • AgCl

  • AgBr

  • AgBr

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7.

Which of the following salts will give highest pH in water?

  • KCl

  • NaCl

  • Na2CO3

  • Na2CO3

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8.

For the reversible reaction,

straight N subscript 12 space left parenthesis straight g right parenthesis space plus 3 straight H subscript 2 left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon 2 NH subscript 3 space left parenthesis straight g right parenthesis space plus Heat
the equilibrium shifts in the forward direction

  • by increasing the concentration of NH3 (g)

  • by decreasing the pressure

  • by decreasing the concentrations of N2 (g)  and H2(g)

  • by decreasing the concentrations of N2 (g)  and H2(g)

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9.

For a given exothermic reaction Kp and Kp' are the equilibrium constant at temperatures T1 and T2 respectively. Assuming that heat of reaction si constant in temperature range between T1 and T2 it is readily observed that

  • Kp> Kp'

  • Kp< Kp'

  • Kp = Kp'

  • Kp = Kp'

1365 Views

10.

Which of these is least likely to act as a lewis base? 

  • CO

  • F-

  • BF3

  • BF3

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