CBSE Questions for Class 12 Engineering Chemistry Surface Chemistry Quiz 15 - MCQExams.com

Although nitrogen does not adsorb on surface at room temperature, it adsorbs on the same surface at 83K . Which one of the following statements is correct?
  • At 83 K, there is formation of monolayer
  • At 83 K, nitrogen is adsorbed as atoms
  • At 83 K, nitrogen molecules are held by chemical bonds
  • At 83 K, there is formation of multimolecular layers
Read two statements:
(1) Milk is an example of oil in water (O/W) type emulsion
(2) Cold cream is an example of water in oil (W/O) type emulsion
  • Only statement 1 is correct
  • Only statement 2 is correct
  • Both are correct
  • None of these
Select correct statement:
  • Water in oil emulsions are more viscous than the aqueous emulsions
  • Electrical conductance of aqueous emulsions is less than that of oil emulsions
  • De-emulsification can be done by soap or detergent
  • An emulsion can be diluted with $$H_2O$$ then it is oil in water (O/W) type
$$10\%$$ sites of catalyst bed have adsorbed by $$H_{2}$$ on Heating $$H_{2} $$  gas is evolved from sites and collected at $$0.03$$ atm and $$300\,K$$ in a small vessel of $$2.46\,cm^{3}$$:
No. of sites available is $$5.4 \times 10^{16}\, per\,cm^{2} $$ and surface area is $$1000\,cm^{2}$$. Find out the no. of surfaces sites occupied per molecule of $$H_{2} $$. (Given $$N_{A} = 6 \times 10^{23})$$
  • $$1$$
  • $$2$$
  • $$3$$
  • None of these
0:0:1


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