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Which of the following is correct regarding solutions of sodium metal in liquid ammonia.
- a)When NH4Cl solid is added to such a solution NaCl is precipitated
- b)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raised
- c)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increased
- d)all the above are correct
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is correct regarding solutions of sodium metal ...
All the statements are true regarding solutions of alkali metals in liquid NH3.
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Which of the following is correct regarding solutions of sodium metal ...
The correct answer is option 'D': all the above are correct. This means that all of the statements mentioned in options a), b), and c) are true regarding solutions of sodium metal in liquid ammonia.
Explanation:
- Sodium metal dissolves in liquid ammonia to form a deep blue solution due to the formation of solvated electrons. The blue color is due to the presence of solvated electrons, which absorb light in the visible region of the spectrum.
- When NH4Cl solid is added to this solution, it reacts with the solvated electrons to form NaCl precipitate. This reaction can be represented as follows:
Na+(ammonia) + e-(ammonia) + NH4Cl(solid) → NaCl(solid) + NH3(gas) + H2(gas)
The NaCl precipitates out of the solution, resulting in a decrease in the blue color.
- The solutions of sodium metal in liquid ammonia are good conductors of electricity. This is because the solvated electrons act as charge carriers, allowing the solution to conduct electricity. The conductivity of the solution decreases as temperature is raised due to the decrease in the concentration of solvated electrons.
- The solutions of sodium metal in liquid ammonia are paramagnetic. Paramagnetism is a property exhibited by substances that contain unpaired electrons. In the case of the solution of sodium metal in liquid ammonia, the solvated electrons are unpaired and, therefore, paramagnetic. However, as the concentration of the solution is increased, the paramagnetic character decreases. This can be attributed to the increased interaction between the solvated electrons, leading to pairing of electrons and a decrease in paramagnetic behavior.
In summary, the correct answer is option 'D' because all of the statements mentioned in options a), b), and c) are true regarding solutions of sodium metal in liquid ammonia.
Explanation:
- Sodium metal dissolves in liquid ammonia to form a deep blue solution due to the formation of solvated electrons. The blue color is due to the presence of solvated electrons, which absorb light in the visible region of the spectrum.
- When NH4Cl solid is added to this solution, it reacts with the solvated electrons to form NaCl precipitate. This reaction can be represented as follows:
Na+(ammonia) + e-(ammonia) + NH4Cl(solid) → NaCl(solid) + NH3(gas) + H2(gas)
The NaCl precipitates out of the solution, resulting in a decrease in the blue color.
- The solutions of sodium metal in liquid ammonia are good conductors of electricity. This is because the solvated electrons act as charge carriers, allowing the solution to conduct electricity. The conductivity of the solution decreases as temperature is raised due to the decrease in the concentration of solvated electrons.
- The solutions of sodium metal in liquid ammonia are paramagnetic. Paramagnetism is a property exhibited by substances that contain unpaired electrons. In the case of the solution of sodium metal in liquid ammonia, the solvated electrons are unpaired and, therefore, paramagnetic. However, as the concentration of the solution is increased, the paramagnetic character decreases. This can be attributed to the increased interaction between the solvated electrons, leading to pairing of electrons and a decrease in paramagnetic behavior.
In summary, the correct answer is option 'D' because all of the statements mentioned in options a), b), and c) are true regarding solutions of sodium metal in liquid ammonia.
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Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer?
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Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer?.
Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is correct regarding solutions of sodium metal in liquid ammonia.a)When NH4Cl solid is added to such a solution NaCl is precipitatedb)The solutions are generally blue, good conductors of electricity and conductivity decreases as temperature is raisedc)The solutions are paramagnetic but paramagnetic character decreases as concentration of solution is increasedd)all the above are correctCorrect answer is option 'D'. Can you explain this answer?.
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