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Q. No.
Assertion (A):
Angular momentum of the electron in the orbit which has four subshells is \(2h\over\pi\).
Reason (R):
Angular momentum of the electron is quantized.
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: Bohr's Theory |
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | Line emission spectra are useful in the study of electronic structure. |
| Reason (R): | Each element has a unique line emission spectrum. |
In the light of the above statements, choose the most appropriate 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. | (A) is false but (R) is true. |
Subtopic: Hydrogen Spectra |
80%
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| Assertion (A): | Emitted radiation will fall in the visible range when an electron jumps from n=4 to n=2 in H-atom. |
| Reason (R): | Balmer series radiations belong to the visible range for hydrogen atoms only. |
| 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: Hydrogen Spectra |
62%
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| Assertion (A): | Half-filled and fully-filled degenerate orbitals are more stable. |
| Reason (R): | Extra stability is due to the symmetrical distribution of electrons and high exchange energy. |
| 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: Shell & Subshell |
93%
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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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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): | 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 |
67%
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| 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 |
55%
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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 |
54%
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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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