Class 12 Exam > Class 12 Questions > Read the passage given below and answer the ...
Start Learning for Free
Read the passage given below and answer the following questions:
All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.
The following questions are multiple choice questions. Choose the most appropriate answer:
Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-
- a)Hg is more inert than Pt
- b)More voltage is required to reduce H+ at Hg than at Pt
- c)Na is dissolved in Hg while it does not dissolve in Pt
- d)Conc, of H+ ions is larger when Pt electrode is taken
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Read the passage given below and answer the following questions:All c...
In electrolysis of NaCl when Pt electrode is taken thenH2 is liberated at cathode while with Hg cathode it forms sodium amalgam.
View all questions of this test
Conc of H+ ions is larger when the Pt electrode is taken. Hence, H+ ions are discharged in preference to Na+ ions. When Hg cathode is used Na+ ions are discharged.
Most Upvoted Answer
Read the passage given below and answer the following questions:All c...
Explanation:
Concentration of H+ ions:
- The concentration of H+ ions is higher when a Pt electrode is used in the electrolysis of NaCl compared to when a Hg electrode is used.
- This is because Hg has a lower overpotential for hydrogen evolution compared to Pt, leading to a slower rate of hydrogen gas evolution at the Hg electrode.
- As a result, more H+ ions are available in the solution for other reactions to occur, such as the reduction of Na+ to form sodium amalgam.
Formation of Sodium Amalgam:
- When a Hg electrode is used in the electrolysis of NaCl, sodium ions are reduced at the electrode to form a sodium amalgam.
- This is because Hg is more reactive towards sodium compared to hydrogen, leading to the formation of sodium amalgam on the Hg electrode surface.
- On the other hand, when a Pt electrode is used, the reduction of Na+ to form sodium metal does not occur due to the higher overpotential required for this reaction.
Inertness of Electrodes:
- Hg is more inert than Pt, which means that it is less likely to participate in side reactions during electrolysis.
- This inertness allows for the selective reduction of sodium ions to form sodium amalgam at the Hg electrode without interference from other reactions.
- In contrast, Pt electrodes may catalyze side reactions such as hydrogen evolution, leading to a different product formation during electrolysis.
Voltage Requirement:
- The voltage required to reduce H+ ions to form hydrogen gas is higher at a Hg electrode compared to a Pt electrode.
- This difference in voltage requirement is due to the different overpotentials for hydrogen evolution at the two electrode materials.
- As a result, a higher voltage is needed to drive the reduction of H+ ions at the Hg electrode, favoring other reactions such as the formation of sodium amalgam.
Concentration of H+ ions:
- The concentration of H+ ions is higher when a Pt electrode is used in the electrolysis of NaCl compared to when a Hg electrode is used.
- This is because Hg has a lower overpotential for hydrogen evolution compared to Pt, leading to a slower rate of hydrogen gas evolution at the Hg electrode.
- As a result, more H+ ions are available in the solution for other reactions to occur, such as the reduction of Na+ to form sodium amalgam.
Formation of Sodium Amalgam:
- When a Hg electrode is used in the electrolysis of NaCl, sodium ions are reduced at the electrode to form a sodium amalgam.
- This is because Hg is more reactive towards sodium compared to hydrogen, leading to the formation of sodium amalgam on the Hg electrode surface.
- On the other hand, when a Pt electrode is used, the reduction of Na+ to form sodium metal does not occur due to the higher overpotential required for this reaction.
Inertness of Electrodes:
- Hg is more inert than Pt, which means that it is less likely to participate in side reactions during electrolysis.
- This inertness allows for the selective reduction of sodium ions to form sodium amalgam at the Hg electrode without interference from other reactions.
- In contrast, Pt electrodes may catalyze side reactions such as hydrogen evolution, leading to a different product formation during electrolysis.
Voltage Requirement:
- The voltage required to reduce H+ ions to form hydrogen gas is higher at a Hg electrode compared to a Pt electrode.
- This difference in voltage requirement is due to the different overpotentials for hydrogen evolution at the two electrode materials.
- As a result, a higher voltage is needed to drive the reduction of H+ ions at the Hg electrode, favoring other reactions such as the formation of sodium amalgam.
|
Explore Courses for Class 12 exam
|
|
Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer?
Question Description
Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer?.
Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam :-a)Hg is more inert than Ptb)More voltage is required to reduce H+ at Hg than at Ptc)Na is dissolved in Hg while it does not dissolve in Ptd)Conc, of H+ ions is larger when Pt electrode is takenCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup