JEE Chemistry - Surface Chemistry

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Question - 1

Which of the following is true in respect of adsorption?

  • A \(\triangle G<0,\triangle S>0,\triangle H<0\)
  • B \(\triangle G<0,\triangle S<0,\triangle H<0\)
  • C \(\triangle G>0,\triangle S>0,\triangle H<0\)
  • D \(\triangle G<0,\triangle S<0,\triangle H>0\)

Question - 2

The most adsorbed gas on activated charcoal is

  • A N2
  • B H2
  • C CO2
  • D CH4

Question - 3

Which of the following statements is uncorrect regarding physiosorption?

  • A It occurs because of van der Eaals forces
  • B More easily liquefiable gases are adsorbed readily
  • C Under high pressure, it results into multimolecular layer on adsorbent surface
  • D Enthalpy of adsorption \(\left( \triangle { H }_{ adsorption } \right) \) is low and positive

Question - 4

Colloidal solution is

  • A True solution
  • B Suspension
  • C Heterogeneous solution
  • D Homogeneous solution

Question - 5

Which one of the following forms an intrinsic colloid?

  • A Sulphur
  • B As2S3
  • C Fe(OH)3
  • D Egg albumin

Question - 6

Which one of the following is a lyophilic colloid?

  • A Milk
  • B Gum
  • C Fog
  • D Blood

Question - 7

Which of the following is correct about lyophilic sols?

  • A They are irreversible
  • B They are formed by inorhanic substances.
  • C They are readily coagulated by addition of electrolytes.
  • D They are self-stabilized.

Question - 8

Purple of cassius is a cooloidal sol of

  • A silver
  • B platinum
  • C gold
  • D iron

Question - 9

Which of the following electrolytes will be most effective in the coagulation of gold sol?

  • A NaNO3
  • B K4 [Fe(CN)6]
  • C Na3PO4
  • D MgCl2

Question - 10

The function of gum arabic in the preparation of Indian ink is

  • A Coagulation
  • B Peptization
  • C Protective action
  • D Adsorption.