Surface Chemistry Practice Test Questions:
Ques. Milk is an example of
(a) Pure solution
(b) Gel
(c) Emulsion
(d) Suspension
Ques. The coagulation of 100 ml of a colloidal sol of gold is completely prevented by addition of 0.25 g of a substance `X‘ to it before adding 10 ml of 1% NaCl solution. The gold number of `X‘ is
(a) 0.25
(b) 25
(c) 250
(d) 2.5
Ques. Which of the following is contributed towards the extra stability of lyophilic colloids?
(a) Hydration
(b) Charge
(c) Colour
(d) Tyndall effect
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Ques. Which one of the following is not a property of hydrophilic sols?
(a) High concentrations of dispersed phase can be easily attained
(b) Coagulation is reversible
(c) Viscosity and surface tension are about the same as for water
(d) The charge of the particle depends on the pH values of the medium; it may be positive, negative or even zero
Ques. Chemisorption
(a) Increases with temperature
(b) Decreases with temperature
(c) Remains unaffected by change of temperature
(d) Either increases or decreases with temperature
Ques. Peptising agent is
(a) Always an electrolyte
(b) Always a non-electrolyte
(c) Electrolyte or non-electrolyte
(d) A lyophilic colloid
Ques. 0.2 gm of fine animal charcoal is mixed with half litre of acetic acid solution and shaken for 30 minutes
(a) Concentration remains same
(b) Concentration increases
(c) Concentration of the solution decrease
(d) None of these
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Ques. Organic catalysts differ from inorganic catalysts
(a) By acting at very high temperature
(b) By acting at low temperature
(c) Being used up
(d) Being proteinous in nature
Ques. A catalyst is used
(a) Only for increasing the velocity of the reaction
(b) For altering the velocity of the reaction
(c) Only for decreasing the velocity of the reaction
(d) All are correct
Ques. The ability of a catalyst to accelerate the chemical reaction is known asa
(a) Selectively
(b) Activity
(c) Negative catalyst
(d) None of these
Ques. Which of the following catalyses the conversion of glucose into ethanol?
(a) Zymase
(b) Invertase
(c) Maltase
(d) Diastase
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Ques. On addition of one ml of 10% NaCl solution to 10 ml gold sol in the presence of 0.25 gm of starch. The coagulation is just prevented, starch has gold number
(a) 0.025
(b) 0.25
(c) 2.5
(d) None
Ques. A biological catalyst is essentially
(a) An amino acid
(b) A carbohydrate
(c) The nitrogen molecule
(d) An enzyme
Ques. Which of the following types of metals form the most efficient catalysts?
(a) Alkali metals
(b) Alkaline earth metals
(c) Transition metals
(d) All of these
Ques. If the dispersed phase is a liquid and the dispersion medium is a solid, the colloid is known as
(a) A sol
(b) An emulsion
(c) A gel
(d) A foam
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Ques. Detergent action of soap is due to
(a) Emulsification properties
(b) Hydrolysis
(c) Ionization
(d) High molecular weight
Ques. In emulsions, the dispersion medium and dispersed phase are
(a) Both solids
(b) Both gases
(c) Both liquids
(d) One is solid and other is liquid
Ques. Blood contains
(a) Positively charged particles
(b) Negatively charged particles
(c) Neutral particles
(d) Negatively as well as positively charged particles
Ques. Which of the following is a lyophilic colloid?a
(a) Milk
(b) Gum
(c) Fog
(d) Blood
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Ques. Emulsifiers are generally
(a) Soap
(b) Synthetic detergents
(c) Lyophilic sols
(d) All of these
