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Which statement(s) is /are correct
- a)A solution is prepared by addition of excess of AgNO3 solution in KI solution. The charge likely to develop on colloidal particle is positive
- b)The effects of pressure on physical adsorption is high if temperature is low
- c)Ultracentrifugation process is used for preparation of lyophobic colloids.
- d)Gold number is the index for extent of gold plating done.
Correct answer is option 'A,B'. Can you explain this answer?
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Which statement(s) is /are correcta)A solution is prepared by addition...
Gold number is the index of protective power of lyophillic colloidal for standard gold sol.
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Which statement(s) is /are correcta)A solution is prepared by addition...
Statement A: A solution is prepared by addition of excess of AgNO3 solution in KI solution. The charge likely to develop on colloidal particle is positive.
This statement is correct. When excess AgNO3 solution is added to KI solution, a redox reaction takes place between Ag+ ions and I- ions. Ag+ ions get reduced to Ag metal, while I- ions get oxidized to I2. The Ag metal particles formed in the solution are colloidal particles. These colloidal particles carry a positive charge due to the loss of electrons during the reduction process.
Statement B: The effects of pressure on physical adsorption is high if temperature is low.
This statement is also correct. Physical adsorption, also known as physisorption, occurs due to weak van der Waals forces between the adsorbate molecules and the surface of the adsorbent. The extent of physisorption is influenced by factors such as temperature and pressure. At low temperatures, the adsorbate molecules have less kinetic energy and therefore can be easily attracted to the adsorbent surface. When pressure is increased, the concentration of the adsorbate molecules in the gas phase also increases, leading to a higher probability of adsorption. Therefore, the effects of pressure on physical adsorption are more pronounced at low temperatures.
Statement C: Ultracentrifugation process is used for preparation of lyophobic colloids.
This statement is incorrect. Ultracentrifugation is a technique used for the purification and separation of colloidal particles based on their size, shape, and density. It is not used for the preparation of colloids. Lyophobic colloids, which are colloids in which the dispersed phase has low affinity for the dispersion medium, are usually prepared by methods such as condensation or dispersion.
Statement D: Gold number is the index for the extent of gold plating done.
This statement is incorrect. The gold number is not related to the extent of gold plating. The gold number is a measure of the protective power of a protective colloid in preventing the coagulation of a gold sol. It is defined as the minimum amount of an electrolyte (usually NaCl) required to cause the coagulation of a given volume of gold sol under specified conditions. Gold plating, on the other hand, refers to the process of depositing a thin layer of gold onto a surface for decorative or functional purposes.
In summary, the correct statements are A and B. Statement C is incorrect, and statement D is also incorrect.
This statement is correct. When excess AgNO3 solution is added to KI solution, a redox reaction takes place between Ag+ ions and I- ions. Ag+ ions get reduced to Ag metal, while I- ions get oxidized to I2. The Ag metal particles formed in the solution are colloidal particles. These colloidal particles carry a positive charge due to the loss of electrons during the reduction process.
Statement B: The effects of pressure on physical adsorption is high if temperature is low.
This statement is also correct. Physical adsorption, also known as physisorption, occurs due to weak van der Waals forces between the adsorbate molecules and the surface of the adsorbent. The extent of physisorption is influenced by factors such as temperature and pressure. At low temperatures, the adsorbate molecules have less kinetic energy and therefore can be easily attracted to the adsorbent surface. When pressure is increased, the concentration of the adsorbate molecules in the gas phase also increases, leading to a higher probability of adsorption. Therefore, the effects of pressure on physical adsorption are more pronounced at low temperatures.
Statement C: Ultracentrifugation process is used for preparation of lyophobic colloids.
This statement is incorrect. Ultracentrifugation is a technique used for the purification and separation of colloidal particles based on their size, shape, and density. It is not used for the preparation of colloids. Lyophobic colloids, which are colloids in which the dispersed phase has low affinity for the dispersion medium, are usually prepared by methods such as condensation or dispersion.
Statement D: Gold number is the index for the extent of gold plating done.
This statement is incorrect. The gold number is not related to the extent of gold plating. The gold number is a measure of the protective power of a protective colloid in preventing the coagulation of a gold sol. It is defined as the minimum amount of an electrolyte (usually NaCl) required to cause the coagulation of a given volume of gold sol under specified conditions. Gold plating, on the other hand, refers to the process of depositing a thin layer of gold onto a surface for decorative or functional purposes.
In summary, the correct statements are A and B. Statement C is incorrect, and statement D is also incorrect.
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Which statement(s) is /are correcta)A solution is prepared by addition of excess of AgNO3solution in KI solution. The charge likely to develop on colloidal particle is positiveb)The effects of pressure on physical adsorption is high if temperature is lowc)Ultracentrifugation process is used for preparation of lyophobic colloids.d)Gold number is the index for extent of gold plating done.Correct answer is option 'A,B'. Can you explain this answer?
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Which statement(s) is /are correcta)A solution is prepared by addition of excess of AgNO3solution in KI solution. The charge likely to develop on colloidal particle is positiveb)The effects of pressure on physical adsorption is high if temperature is lowc)Ultracentrifugation process is used for preparation of lyophobic colloids.d)Gold number is the index for extent of gold plating done.Correct answer is option 'A,B'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Which statement(s) is /are correcta)A solution is prepared by addition of excess of AgNO3solution in KI solution. The charge likely to develop on colloidal particle is positiveb)The effects of pressure on physical adsorption is high if temperature is lowc)Ultracentrifugation process is used for preparation of lyophobic colloids.d)Gold number is the index for extent of gold plating done.Correct answer is option 'A,B'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which statement(s) is /are correcta)A solution is prepared by addition of excess of AgNO3solution in KI solution. The charge likely to develop on colloidal particle is positiveb)The effects of pressure on physical adsorption is high if temperature is lowc)Ultracentrifugation process is used for preparation of lyophobic colloids.d)Gold number is the index for extent of gold plating done.Correct answer is option 'A,B'. Can you explain this answer?.
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