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Q. No.The ratio of the wavelengths of the last lines of the Balmer to Lyman series is
1.
4:1
2.
27:5
3.
3:1
4.
9:4
Subtopic: Hydrogen Spectra |
76%
Level 2: 60%+
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If the electronic structure of oxygen atom is written as 
it would violate:
1. Hund's rule.
2. Paulis exclusion principle.
3. Both Hund's and Pauli's principles.
4. None of the above.
Subtopic: Pauli's Exclusion Principle & Hund's Rule |
76%
Level 2: 60%+
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Given below are two statements:
In light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Bohr’s orbits are also called stationary states. |
| Reason (R): | Electrons are stationary in an orbit. |
| 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 |
70%
Level 2: 60%+
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| Assertion (A): | In the third energy level, there is no f subshell. |
| Reason (R): | For n = 3, the possible values of l are 0, 1, 2 and for f subshell l = 3. |
| 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 |
80%
Level 1: 80%+
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| Assertion (A): | The angular momentum of an electron in an atom is quantized. |
| Reason (R): | In an atom, only those orbits are permitted in which the angular momentum of the electron is a natural number multiple of h/2π. |
| 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 |
81%
Level 1: 80%+
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| Assertion (A): | The radius of the second orbit of He+ is equal to that of the first orbit of hydrogen. |
| Reason (R): | The radius of an orbit in hydrogen-like species is directly proportional to n and inversely proportional to Z. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of the (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of the (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Bohr's Theory |
73%
Level 2: 60%+
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| Assertion (A): | The number of radial nodes in 3 dz2 , is zero. |
| Reason (R): | The number of angular nodes of atomic orbitals is equal to the value of l. |
| 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: Nodal Plane |
70%
Level 2: 60%+
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The velocity associated with a proton moving at a potential difference of 1000 V is 4.37 × 105 ms–1. If the hockey ball of mass 0.1 kg is moving with this velocity, then the wavelength associated with this velocity would be:
Subtopic: De Broglie Equation |
70%
Level 2: 60%+
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What is the velocity associated with a neutron that has a wavelength of 800 pm?
| 1. | 496 m s–1 | 2. | 567 m s–1 |
| 3. | 494 cm s–1 | 4. | 501 m s–1 |
Subtopic: De Broglie Equation |
51%
Level 3: 35%-60%
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If the velocity of the electron is 1.6 × 106 . The de Broglie wavelength associated with this electron is:
Subtopic: De Broglie Equation |
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Level 2: 60%+
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