Class 9 Exam > Class 9 Questions > Which of the following statements is incorrec...
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Which of the following statements is incorrect?
- a)On addition of catalyst the equilibrium constant value is not affected.
- b)Equilibrium constant for a reaction with negative ΔH value decreases as the temperature increases
- c)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.
- d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is incorrect?a)On addition of cataly...
ice water is in equilibrium therefore mass of ice and water does not change with time.
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Which of the following statements is incorrect?a)On addition of cataly...
Incorrect Statement: In equilibrium mixture of ice and water kept in a perfectly insulated flask, the mass of ice and water does not change with time.
In order to understand why this statement is incorrect, let's break down the concept of equilibrium and the phase change between ice and water.
1. Equilibrium
In a chemical reaction, equilibrium refers to a state where the rate of the forward reaction is equal to the rate of the reverse reaction. At equilibrium, the concentrations of reactants and products remain constant over time. The equilibrium constant (K) is a measure of the concentrations of the reactants and products at equilibrium and is unaffected by the addition of a catalyst (Option A).
2. Phase Change: Ice and Water
When ice and water are in contact, they can exist in equilibrium with each other. At this equilibrium, the rate of melting of ice is equal to the rate of freezing of water. This equilibrium is governed by the melting point of ice, which is 0°C at atmospheric pressure.
Explanation of the Incorrect Statement:
When ice and water are kept in a perfectly insulated flask, the system is isolated from its surroundings. This means that there is no exchange of heat or mass with the surroundings. However, it does not imply that the mass of ice and water will remain constant over time (Option C).
Reasoning:
- As the temperature of the system is maintained at 0°C, the ice and water will be in equilibrium, meaning there will be a continuous interchange of molecules between the solid (ice) and liquid (water) phases.
- At the molecular level, some water molecules will be continuously breaking away from the solid phase and entering the liquid phase (melting), while others will be leaving the liquid phase and entering the solid phase (freezing).
- This continuous molecular interchange results in a dynamic equilibrium, where the mass of ice and water may change over time, but the overall composition (ratio of ice to water) remains constant.
Conclusion:
In a perfectly insulated flask, the mass of ice and water in equilibrium will change over time, even though the overall composition remains constant. Therefore, the statement in option C is incorrect.
In order to understand why this statement is incorrect, let's break down the concept of equilibrium and the phase change between ice and water.
1. Equilibrium
In a chemical reaction, equilibrium refers to a state where the rate of the forward reaction is equal to the rate of the reverse reaction. At equilibrium, the concentrations of reactants and products remain constant over time. The equilibrium constant (K) is a measure of the concentrations of the reactants and products at equilibrium and is unaffected by the addition of a catalyst (Option A).
2. Phase Change: Ice and Water
When ice and water are in contact, they can exist in equilibrium with each other. At this equilibrium, the rate of melting of ice is equal to the rate of freezing of water. This equilibrium is governed by the melting point of ice, which is 0°C at atmospheric pressure.
Explanation of the Incorrect Statement:
When ice and water are kept in a perfectly insulated flask, the system is isolated from its surroundings. This means that there is no exchange of heat or mass with the surroundings. However, it does not imply that the mass of ice and water will remain constant over time (Option C).
Reasoning:
- As the temperature of the system is maintained at 0°C, the ice and water will be in equilibrium, meaning there will be a continuous interchange of molecules between the solid (ice) and liquid (water) phases.
- At the molecular level, some water molecules will be continuously breaking away from the solid phase and entering the liquid phase (melting), while others will be leaving the liquid phase and entering the solid phase (freezing).
- This continuous molecular interchange results in a dynamic equilibrium, where the mass of ice and water may change over time, but the overall composition (ratio of ice to water) remains constant.
Conclusion:
In a perfectly insulated flask, the mass of ice and water in equilibrium will change over time, even though the overall composition remains constant. Therefore, the statement in option C is incorrect.
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Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer?
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Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer?.
Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
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Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which of the following statements is incorrect?a)On addition of catalyst the equilibrium constant value is not affected.b)Equilibrium constant for a reaction with negativeΔH value decreases as the temperature increasesc)In equilibrium mixture of ice and water kept in perfectly insulated flask mass of ice and water does not change with time.d)The intensity of red colour increases when oxalic acid is added to a solution containing iron (III). nitrate and potassium thiocyanate.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 9 tests.
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