Comprehension
A colloid is a heterogenous system in which one substance is dispersed as very fine particles in another substance called dispersion medium. Colloids are classfied on the basis of physical state of dispersed phase and dispersion medium. Nature of interaction between dispersed phase and dispersion medium and types of particles of dispersed phase. There are various methods for the preparation of collodial solutions such as chemical methods, electrical disintegration and peptization. Colloidal solutions when prepared, generally contain excessive amount of electrolytes, and some other soluble impurities. The process used for reducing the amount of impurities to a requisite minimum is known as purification of collodial solution. Purification of collodial solution is carried out by various methods such as Dialysis, Electrodialysis, Ultrafiltration etc. Colligative properties, Tyndall effect, colour, Brownian movement charge on collodial particles, electrophoresis, congulation are various properties exhibited by colloidal solution.
Question: 1
The formation of micelles takes place only above a particular temperature known as :
The formation of micelles takes place only above a particular temperature known as :
Updated On: Sep 23, 2024
- Critical temperature
- Kraft temperature
- Critical micelle concentration
- Micelle temperature
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The Correct Option is B
Solution and Explanation
The correct option is (B) :Kraft temperature.
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Question: 2
The chemical composition of collodion is :
The chemical composition of collodion is :
Updated On: Sep 23, 2024
- 4% solution of alcohol in a mixture of nitrocellulose and ether.
- 4% solution of nitrocellulose in a mixture of acetone and ether.
- 4% solution of nitrocellulose in a mixture of alcohol and ether.
- 4% solution of nitrohenol in a mixture of alcohol and ether.
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The Correct Option is C
Solution and Explanation
The correct option is (C) :4% solution of nitrocellulose in a mixture of alcohol and ether..
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Question: 3
Which among the given statements CANNOT be defined as the property of collodial solution :
Which among the given statements CANNOT be defined as the property of collodial solution :
Updated On: Sep 23, 2024
- Finest gold is red in colour, as the size of particle increases, it appear purple, then blue and finally golden.
- The charge on the sol particles is due to preferential adsorption of ions from solution.
- Electric arc is struck between the electrodes of the metal immersed in the dispersion medium.
- Collodial particles always appear to be in a state of continous zig-zag motion.
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The Correct Option is C
Solution and Explanation
The correct option is (C) :Electric arc is struck between the electrodes of the metal immersed in the dispersion medium..
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Question: 4
Identify correct increasing order of coagulation power of electrolytes :
A. NaCl < MgCl2 < AlCl3
B. AlCl3 < MgCl2 < NaCl
C. Na4[Fe(CN)6] < Na3PO4 < NaCl < Na2SO4
D. KCl < K3PO4 < K2SO4 < K4[Fe(CN)6]
E. KCl < K2SO4 < K3PO4 < K4[Fe(CN)6]
Choose the correct answer from the options given below :
Identify correct increasing order of coagulation power of electrolytes :
A. NaCl < MgCl2 < AlCl3
B. AlCl3 < MgCl2 < NaCl
C. Na4[Fe(CN)6] < Na3PO4 < NaCl < Na2SO4
D. KCl < K3PO4 < K2SO4 < K4[Fe(CN)6]
E. KCl < K2SO4 < K3PO4 < K4[Fe(CN)6]
Choose the correct answer from the options given below :
A. NaCl < MgCl2 < AlCl3
B. AlCl3 < MgCl2 < NaCl
C. Na4[Fe(CN)6] < Na3PO4 < NaCl < Na2SO4
D. KCl < K3PO4 < K2SO4 < K4[Fe(CN)6]
E. KCl < K2SO4 < K3PO4 < K4[Fe(CN)6]
Choose the correct answer from the options given below :
Updated On: Sep 23, 2024
- B and D only
- A, B, C only
- C, D and E only
- A, E only
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The Correct Option is D
Solution and Explanation
The correct option is (D) :A, E only.
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Question: 5
When FeCl3 is added to excess of hot water :
When FeCl3 is added to excess of hot water :
Updated On: Sep 23, 2024
- A positively charged sol of hydrated Ferric oxide is formed due to adsorption of Fe3+ ions.
- Negatively charged sol is obtained with adsorption of OH- ions.
- A negatively charged sol is formed due to adsorption of Fe3+ ions.
- A positively charged sol is formed by the adsorption of OH- ions.
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The Correct Option is A
Solution and Explanation
The correct option is (A) :A positively charged sol of hydrated Ferric oxide is formed due to adsorption of Fe3+ ions.
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