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Q. No.Given below are two statements:
Assertion (A):
When light consisting of wavelengths corresponding to the Balmer series is incident on a gas containing \(He^{+}\) ions in the first three excited states - it can be absorbed by the \(He^{+}\) ions.
Reason (R):
All the energy levels of the He+ ions are the same as those of the \(H\) atoms.
1.
(A) is True but (R) is False.
2.
(A) is False but (R) is True.
3.
Both (A) and (R) are True and (R) is the correct explanation of (A).
4.
Both (A) and (R) are True but (R) is not the correct explanation of (A).
Subtopic: Spectral Series |
62%
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Select the correct option based on the statements given below:
| Assertion (A): | The magnetic moment of a hydrogen-like atom is higher when it is in a state of higher quantum number \(n.\) |
| Reason (R): | The magnetic moment of hydrogen-like atom, as calculated from Bohr's theory, is directly proportional to the principal quantum number \(n.\) |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Bohr's Model of Atom |
77%
From NCERT
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The energy of an atom with a K-shell vacancy is EK, that with an L-shell vacancy is EL, and that with an M- shell vacancy is EM: all compared to an atom with no vacancy, then,
(I) EK < EL
(II) EL > EM
(III) EL - EK = \(E_{K\alpha}\), the energy of \(K_\alpha \) photon
1. I is true
2. I, III are true
3. II is true
4. I, II are true
(I) EK < EL
(II) EL > EM
(III) EL - EK = \(E_{K\alpha}\), the energy of \(K_\alpha \) photon
1. I is true
2. I, III are true
3. II is true
4. I, II are true
Subtopic: Bohr's Model of Atom |
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Given below are two statements:
| Assertion (A): | The positively charged nucleus of an atom has a radius of almost \(10^{-15}~\text{m}\). |
| Reason (R): | In \(\alpha\)-particle scattering experiment, the distance of the closest approach for \(\alpha\)-particle is \(\approx 10^{-15}~m\). |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Various Atomic Models |
58%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | The hydrogen atom consists of only one electron but its emission spectrum has many lines. |
| Reason (R): | Only Lyman series is found in the absorption spectrum of hydrogen atoms whereas in the emission spectrum, all the series are found. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Spectral Series |
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Given below are two statements:
| Assertion (A): | The Balmer series lies in the visible region of the electromagnetic spectrum. |
| Reason (R): | \(\frac{1}{\lambda}=\mathrm{R}\left[\frac{1}{2^{2}}-\frac{1}{n^{2}}\right], \text { where } n=3,4,5\). |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Spectral Series |
63%
From NCERT
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Given below are two statements:
| Statement I: | The time period of revolution of an electron in its \(n^\text{th}\) Bohr orbit in an atom is directly proportional to \(n^3.\) |
| Statement II: | The K.E. of an electron in its \(n^\text{th}\) Bohr orbit in an atom is directly proportional to \(n.\) |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Bohr's Model of Atom |
79%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Rydberg's constant does not vary with the mass number of a given element. |
| Reason (R): | The reduced mass of the electron is dependent on the mass of the nucleus only. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Bohr's Model of Atom |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
.
| Assertion (A): | LASER is used to measure distant objects as moon. |
| Reason (R): | They are highly coherent sources of light. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Spectral Series |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Bohr had to postulate that the electrons in stationary orbits around the nucleus do not radiate. |
| Reason (R): | According to classical physics all accelerating electrons radiate. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Bohr's Model of Atom |
54%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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