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Which of the following statements is correct?
- a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.
- b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.
- c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.
- d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.
Correct answer is option 'A,B,D'. Can you explain this answer?
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Most Upvoted Answer
Which of the following statements is correct?a)Fluorescence is the pro...
C is not correct bcoz those reactions which don't react themselves are photosensitzed reactions nd not chain reactions... rest of all are correct
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Which of the following statements is correct?a)Fluorescence is the pro...
Fluorescence, Phosphorescence, and Quantum Yield
Statement a: Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.
Statement b: Phosphorescence is the process of an excited state returning to the ground state of a different multiplicity with the emission of light.
Statement d: Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.
Explanation:
Fluorescence:
- Fluorescence is a phenomenon where a molecule absorbs light energy and then quickly emits light energy while returning to the ground state.
- The process involves absorption of a photon by a molecule, promoting an electron to an excited state.
- The excited state is generally a singlet state, which means it has the same multiplicity as the ground state.
- The excited state quickly decays to the ground state, releasing the excess energy in the form of light.
- The emitted light has a longer wavelength (lower energy) than the absorbed light.
- Fluorescence occurs rapidly, typically within nanoseconds.
Phosphorescence:
- Phosphorescence is a process similar to fluorescence but with a longer lifetime of the excited state.
- In phosphorescence, the excited state is a triplet state, which has a different multiplicity than the ground state.
- As a result, the transition from the excited state to the ground state is spin-forbidden, leading to a slower decay process.
- The excited state can persist for milliseconds to hours before returning to the ground state and emitting light.
- The emitted light has a longer wavelength (lower energy) than the absorbed light, similar to fluorescence.
Quantum Yield:
- Quantum yield is a measure of how efficiently a process occurs.
- In the context of fluorescence or phosphorescence, it is the ratio of the number of photons emitted to the number of photons absorbed.
- Quantum yield is expressed as a decimal or percentage, with a higher value indicating a more efficient process.
- It provides information about the overall efficiency of the excited state decay and emission process.
Correct Statements:
- The correct statements are a, b, and d.
- Statement a correctly describes fluorescence as the process of an excited state returning to the ground state of the same multiplicity with the emission of light.
- Statement b correctly describes phosphorescence as the process of an excited state returning to the ground state of a different multiplicity with the emission of light.
- Statement d correctly defines quantum yield as the ratio of moles consumed in a process to the number of photons absorbed.
Summary:
- Fluorescence involves the emission of light from an excited state of the same multiplicity as the ground state.
- Phosphorescence involves the emission of light from an excited state of a different multiplicity than the ground state.
- Quantum yield is the measure of efficiency in a process, specifically in terms of emitted photons compared to absorbed photons.
Statement a: Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.
Statement b: Phosphorescence is the process of an excited state returning to the ground state of a different multiplicity with the emission of light.
Statement d: Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.
Explanation:
Fluorescence:
- Fluorescence is a phenomenon where a molecule absorbs light energy and then quickly emits light energy while returning to the ground state.
- The process involves absorption of a photon by a molecule, promoting an electron to an excited state.
- The excited state is generally a singlet state, which means it has the same multiplicity as the ground state.
- The excited state quickly decays to the ground state, releasing the excess energy in the form of light.
- The emitted light has a longer wavelength (lower energy) than the absorbed light.
- Fluorescence occurs rapidly, typically within nanoseconds.
Phosphorescence:
- Phosphorescence is a process similar to fluorescence but with a longer lifetime of the excited state.
- In phosphorescence, the excited state is a triplet state, which has a different multiplicity than the ground state.
- As a result, the transition from the excited state to the ground state is spin-forbidden, leading to a slower decay process.
- The excited state can persist for milliseconds to hours before returning to the ground state and emitting light.
- The emitted light has a longer wavelength (lower energy) than the absorbed light, similar to fluorescence.
Quantum Yield:
- Quantum yield is a measure of how efficiently a process occurs.
- In the context of fluorescence or phosphorescence, it is the ratio of the number of photons emitted to the number of photons absorbed.
- Quantum yield is expressed as a decimal or percentage, with a higher value indicating a more efficient process.
- It provides information about the overall efficiency of the excited state decay and emission process.
Correct Statements:
- The correct statements are a, b, and d.
- Statement a correctly describes fluorescence as the process of an excited state returning to the ground state of the same multiplicity with the emission of light.
- Statement b correctly describes phosphorescence as the process of an excited state returning to the ground state of a different multiplicity with the emission of light.
- Statement d correctly defines quantum yield as the ratio of moles consumed in a process to the number of photons absorbed.
Summary:
- Fluorescence involves the emission of light from an excited state of the same multiplicity as the ground state.
- Phosphorescence involves the emission of light from an excited state of a different multiplicity than the ground state.
- Quantum yield is the measure of efficiency in a process, specifically in terms of emitted photons compared to absorbed photons.
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Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer?
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Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer?.
Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer?.
Solutions for Which of the following statements is correct?a)Fluorescence is the process of an excited state returning to the ground state of the same multiplicity with the emission of light.b)Phosphorescence is the process of an excited state returning to the ground state of the different multiplicity with the emission of light.c)Reaction in which the molecules absorbing light do not react themselves but can induce other molecules to reacts are called chain reaction.d)Quantum yield is the ratio of the number of moles consumed in a process and the number of Einstein absorbed by it.Correct answer is option 'A,B,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry.
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