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. |
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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. |
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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. |
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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. |
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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. |
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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.
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The mass and charge of one mole of electrons are, respectively:
1. 5.48 × kg, 9.65 C,
2. 5.48 × C, 1.098 x 1027
3. 5.48 × kg, 9.65 × C
4. 9.65 × C, 1.098 x 1027
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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 |
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The maximum number of neutrons are present in the nuclei of
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The complete symbol for the atom with the given atomic number (Z) and atomic mass (A) would be, respectively,
i. | Z = 17 , A = 35. |
ii. | Z = 92 , A = 233. |
iii. | Z = 4 , A = 9. |
1.
2.
3.
4.
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