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. |
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. |
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. |
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. |
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. |
The correct statement(s) among the following regarding quantum numbers is -
a. | Angular quantum number determines the three-dimensional shape of the orbital |
b. | The principal quantum number determines the orientation and energy of the orbital |
c. | Magnetic quantum number determines the size of the orbital |
d. | Spin quantum number of an electron determines the orientation of the spin of the electron relative to the chosen axis |
Choose the correct option:
1. (a), (d)
2. (b), (c)
3. (c), (d)
4. (b), (d)
Consider the following graph.
The correct relation between T1 and T2 is-
1. T1 > T2
2. T1 < T2
3. T1 = T2
4. None of the above
The ultraviolet region in the above figure is indicated by:
1. D
2. B
3. A
4. C
The graph that represents the probability density vs distance of the electron from the nucleus for 2s orbital is -
1.
2.
3.
4.
The graph that represents the variation of (probability of density of finding the electron) with distance (r) is given below:
The number of nodes as per the graph is-
1. zero
2. 1
3. 2
4. Cannot predict