17
MCQ (Multiple Correct Answer)
Identify the pairs which are not of isotopes?
A
${ }_6^{12} X,{ }_6^{13} Y$
B
${ }_{17}^{35} X,{ }_{17}^{37} Y$
C
${ }_6^{14} X,{ }_7^{14} Y$
D
${ }_4^8 X,{ }_5^8 Y$
18
MCQ (Multiple Correct Answer)
Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals.
A
(i) $n=3, l=2, m_l=-2, m_s=-\frac{1}{2}$
(ii) $n=3, l=2, m_l=-1, m_s=-\frac{1}{2}$
B
(i) $n=3, l=1, m_l=1, m_s=+\frac{1}{2}$
(ii) $n=3, l=2, m_l=1, m_s=+\frac{1}{2}$
C
(i) $n=4, l=1, m_l=1, m_s=+\frac{1}{2}$
(ii) $n=3, l=2, m_l=1, m_s=+\frac{1}{2}$
D
(i) $n=3, l=2, m_l=+2, m_s=-\frac{1}{2}$
(ii) $n=3, l=2, m_l=+2, m_s=+\frac{1}{2}$
19
MCQ (Multiple Correct Answer)
Which of the following sets of quantum numbers are correct?
A
| $n$ | $l$ | $m$ |
|---|---|---|
| 1 | 1 | +2 |
B
| $n$ | $l$ | $m$ |
|---|---|---|
| 2 | 1 | +1 |
C
| $n$ | $l$ | $m$ |
|---|---|---|
| 3 | 2 | $-$2 |
D
| $n$ | $l$ | $m$ |
|---|---|---|
| 3 | 4 | $-$2 |
20
MCQ (Multiple Correct Answer)
In which of the following pairs, the ions are isoelectronic?
A
$\mathrm{Na}^{+}, \mathrm{Mg}^{2+}$
B
$\mathrm{AP}^{3+}, \mathrm{O}^{-}$
C
$\mathrm{Na}^{+}, \mathrm{O}^{2-}$
D
$\mathrm{N}^{3-}, \mathrm{Cl}^{-}$
21
MCQ (Multiple Correct Answer)
Which of the following statements concerning the quantum numbers are correct?
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 electron relative to the chosen axis