Monthly archives: June, 2016

Surface Chemistry – 3

1) A lump of coal burns slowly in air while coat dust burns explosively because of the a) Less mass of powdered coal b) Large surface area of coal dust c) Lower ignition temperature of coal dust d) Nature of coal dust 2) Protons accelerate the hydrolysis of esters. This is an example of a) …

Surface Chemistry – 2

1) Which one of the following substances acts as an emulsifier? a) Common salt b) Urea c) Soap d) Oils 2) In which one of the following properties do emulsions differ from colloidal sols? a) Tyndall effect b) Brownian movement c) Electrophoresis d) Size of the particles of the dispersed phase 3) The cleaning action …

Surface Chemistry – 1

1) Zeolites have high porosity due to their a) one dimensional network b) two dimensional network c) three dimensional network d) all the above 2) Digestion of fats in the intestine is facilitated by a) coagulation b) peptisation c) precipitation d) emulsification 3) Collodion is obtained by a) electro dialysis of cellulose nitrate b) peptisation …

P – Block Elements – 1

1) Ozone reacts with NO2 as per the equation O3 + 2NO2O2+ N2O5 The mechanism of the reaction O3+NO2NO3+O2(slow) NO3+ NO2 N2O5(fast) The rate law is a) r=k[O3] [NO2]2 b) r=k[NO3] [NO2] c) r=k[O3] [NO2] d) r=k[O3] [NO2]1/2 2) 75% of the total constituents of earth consist of a) Nitrogen and Oxygen b) Silicon and …

BioMolecules MCQs – III

1) The enzyme pepsin hydrolyses a) proteins to amino acids b) fats to fatty acids c) glucose to ethyl alcohol d) polysaccharides to monosaccharides. 2) Which of the following gives maximum energy in metabolic processes ? a) Protein b) Vitamins c) Lipids d) Carbohydrates. 3) Which of the following are oligosaccharides ? a) Cellobiose b) …