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Preparation and Properties of colloids - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: Preparation and Properties of colloids (15 Questions)

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Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 15

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Test: Preparation and Properties of colloids - Question 1

During the action of enzyme "Zymase", glucose is converted into_____, with the liberation of carbon dioxide gas.

Detailed Solution: Question 1

- Zvmase enzyme converts glucose into ethyl alcohol and carbon dioxide.
- Alcoholic fermentation converts one mole of sucrose into two moles of ethanol and two moles of carbon dioxide, producing two moles of ATP in the process.
- Diastase transforms starch into maltose and after that, it converts it this into glucose.
- Invertase is an enzyme that catalyzes the hydrolysis (breakdown) of sucrose (table sugar) into fructose and glucose.
- Maltase present in saliva as well as in the pancreas which breaks down sugars to form glucose

Test: Preparation and Properties of colloids - Question 2

Catalytic poisons act by :

Detailed Solution: Question 2

The catalytic poisons decrease the activity of the catalyst because they are preferentially adsorbed on the surface of catalyst.

Test: Preparation and Properties of colloids - Question 3

The efficiency of an enzyme in catalysing a reaction is due to its capacity

Detailed Solution: Question 3

Efficiency of catalysing property of a catalyst is inversely proportional to activation energy.

Test: Preparation and Properties of colloids - Question 4

The figure given below shows three velocity-substrate concentration curves for an enzyme reaction. What do the curves and c depict respectively?

Detailed Solution: Question 4

In the given figure, curve shows normal enzyme reaction, while curve shows a competitive inhibition reaction, in which competitive inhibitors that resemble the substrate molecules, bind to the active site of the enzyme, whereas, curve shows non-competitive inhibition reaction, in which the inhibitor binds to a part of the enzyme or enzyme substrate complex, other than the active site, known as the allosteric site.

Test: Preparation and Properties of colloids - Question 5

The density of gold is . If of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 , then the number of gold particles per of
the sol will be :

Detailed Solution: Question 5

Volume of gold dispersed in 1 L water

Radius of gold sol particle
Volume of gol sol particle

No. of gold sol particles in

No. of gold sol particles in one

Test: Preparation and Properties of colloids - Question 6

Butter is a colloid formed when

Detailed Solution: Question 6

Butter (liquid - solid) water dispersed in fat

Test: Preparation and Properties of colloids - Question 7

Cloud or fog is a colloidal system in which the dispersed phase and the dispersion medium are

Detailed Solution: Question 7

Cloud and fog are colloidal system having dispersed phase liquid and dispersion medium gas

Test: Preparation and Properties of colloids - Question 8

Which of the following constitutes irreversible colloidal system in water as dispersion medium?

Detailed Solution: Question 8

All are irreversible colloidal systems.

Test: Preparation and Properties of colloids - Question 9

Which one of the following statements is not correct in respect of lyophilic sols?

Detailed Solution: Question 9

In lyophilic sol no charge present.

Test: Preparation and Properties of colloids - Question 10

Select incorrect statement:

Detailed Solution: Question 10

No stabilising agent required for the preparation of lyophilic sol.

Test: Preparation and Properties of colloids - Question 11

The stabilization of the dispersed phase in a lyophobic sol is due to

Detailed Solution: Question 11

Due to preferential adsorption of similar ions, an electrical double layer is formed on the surface of colloidal particles e.g., arsenius sulphide solution.

Test: Preparation and Properties of colloids - Question 12

A detergent solution becomes a colloidal sol at a concentration of On an average colloidal particles are present in . What is the average number of ions which are contained by one colloidal particle (micelle)? Given:

Detailed Solution: Question 12

No. of sodium lauryl sulphate molecules
in 1 litre solution

No. of sodium lauryle sulphate molecules per
No. of colloidal particles per No. of molecules per colloidal particle

Test: Preparation and Properties of colloids - Question 13

Colloidal gold is prepared by

Detailed Solution: Question 13

Colloidal gold is prepared by Bredig's arc method.

Test: Preparation and Properties of colloids - Question 14

white precipitate of is peptized with di. . The sol particle will carry

Detailed Solution: Question 14


(Positive charge)

Test: Preparation and Properties of colloids - Question 15

The sol prepared by Bredig's Arc method is X and the charge of sol particles of it is q. and q are respectively.

Detailed Solution: Question 15

Bredig's Arc (Electrical disintegration) method is used to prepare colloidal sals of metals such as gold, silver, platinum etc... In this method, electric arc is struck between electrodes of the metal immersed in the dispersion medium. The intense heat produced vapourises the metal, which then condenses to form particles of the colloidal size. Metal sols acquire negative charge.

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