A emulsifier is a substance which from Chemistry Surface Chemist

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 Multiple Choice QuestionsMultiple Choice Questions

81.

Which of the following is not a characteristic of chemisorption?

  • H is of the order of 400 kJ

  • Adsorption is irreversible

  • Adsorption may be multimolecular layer

  • Adsorption is specific


82.

The concentration of electrolyte required to coagulate a given amount of As2S3 solution is minimum in the case of

  • magnesium nitrate

  • potassium nitrate

  • potassium sulphate

  • aluminium nitrate


83.

In the manufacture of sulphuric acid by contact process, Tyndall box is used to

  • filter dust particles

  • remove impurities

  • convert SO2 to SO3

  • test the presence of dust particles


84.

Pick out the statement which is not relevant in the discussion of colloids

  • sodium aluminium silicate is used in the softening of hard water

  • potash alum is used m shavmg rounds and as a styptic in medicine

  • artificial rain is caused by throwing electrified sand on the clouds from an aeroplane

  • deltas are formed at a place where the river pours its water into the sea


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85.

The diameter of colloidal particles range from

  • 10-6m to 10-9m

  • 10-9m to 10-12m

  • 103m to 10-3m

  • 10-3m to 10-6 m


86.

Identify the gas which is readily adsorbed by activated charcoal

  • N2

  • SO2

  • H2

  • O2


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87.

A emulsifier is a substance which

  • stabilises the emulsion

  • homogenises the emulsion

  • coagulates the emulsion

  • accelerates the dispersion of liquid in liquid


A.

stabilises the emulsion

The substance which is added to stabilise the emulsion is known as emulsifier or emulsifying agent. These are of two types:

(i) Water in oil

(ii) Oil in water


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88.

The temperature of the system decreases in an

  • adiabatic compression

  • isothermal compression

  • isothermal expansion

  • adiabatic expansion


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89.

An example for autocatalysis is :

  • oxidation of NO to NO2

  • oxidation of SO2 to SO3

  • decomposition of KClOto KCl and O2

  • oxidation of oxalic acid by acidified KMnO4


90.

2SO2 (g) + O2 (g) V2O5 is an example for 

  • neutralisation reaction

  • homogeneous catalysis

  • heterogeneous catalysis

  • irreversible reaction


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