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Q. No.Assertion(A): \(h/\pi\) is the angular momentum of the electron in the second orbit of He+.
Reason(R): Angular momentum of an electron in a subshell is given by \(\sqrt{l(l+1)} \times {h\over 2\pi}\) .
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 and R is false.
4. A and R both are false.
Reason(R): Angular momentum of an electron in a subshell is given by \(\sqrt{l(l+1)} \times {h\over 2\pi}\) .
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 and R is false.
4. A and R both are false.
Subtopic: Bohr's Theory |
60%
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| Assertion (A): | The number of spherical nodes in 3p orbital is one. |
| Reason (R): | Number of spherical nodes = I, for orbital I =1. |
| 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: Nodal Plane |
53%
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Consider the given two statements:
Select the correct option:
| Assertion (A): | The absorption spectrum consists of some bright lines separated by dark spaces. |
| Reason (R): | The emission spectrum consists of dark lines. |
| 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: Type of Spectra |
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| Assertion (A): | In the Balmer series of the hydrogen spectrum, the transitions occur from an initial energy level ( \(n_1\)= 2 ) to successive higher energy levels \(n_2\)= 3, 4, 5,... . |
| Reason (R): | In the Balmer series of the hydrogen spectrum, the transitions with the highest wavelength correspond to energy level values of n equal to 4 and 6. |
| 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: Hydrogen Spectra |
73%
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| Assertion (A): | Hydrogen atom has only one electron in its orbit. But it produces several spectral lines. |
| Reason (R): | There are many excited energy levels available. |
| 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: Hydrogen Spectra |
84%
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Assertion(A): A spectral line will be seen for a 2px —► 2py transition.
Reason(R): Energy is released in the form of waves of light when the electron drops from 2px to 2py orbital.
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 and R is false.
4. A and R both are false.
Reason(R): Energy is released in the form of waves of light when the electron drops from 2px to 2py orbital.
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 and R is false.
4. A and R both are false.
Subtopic: Hydrogen Spectra |
56%
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Given below are two statements:
| Assertion (A): | Electrons are ejected from a certain metal when either blue or violet light strikes the metal surface. However, only violet light causes electron ejection from a second metal. |
| Reason (R): | The electrons in the first metal require less energy for ejection. |
| 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: Photo Electric Effect |
56%
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| Assertion (A): | Helium and berylium having the similar outer electronic configuration of type \(ns^2\). |
| Reason (R): | Both are chemically inert. |
| 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: AUFBAU Principle |
68%
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Assertion(A): The energy of an electron is largely determined by its principal quantum number.
Reason(R): Principal quantum number is a measure of the most possible distance of finding the electron around the nucleus.
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 and R is false.
4. A and R both are false.
Reason(R): Principal quantum number is a measure of the most possible distance of finding the electron around the nucleus.
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 and R is false.
4. A and R both are false.
Subtopic: Quantum Numbers & Schrodinger Wave Equation |
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| Assertion (A): | The ground state configuration of Cr is 3d54s1. |
| Reason (R): | A set of half-filled orbitals containing one electron each with their spin parallel provides extra stability. |
| 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: De Broglie Equation |
84%
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