11
MCQ (Single Correct Answer)
Total number of orbitals associated with third shell will be ........... .
A
2
B
4
C
9
D
3
12
MCQ (Single Correct Answer)
Orbital angular momentum depends on ............. .
A
$l$
B
$n$ and $l$
C
$n$ and $m$
D
$m$ and $s$
13
MCQ (Single Correct Answer)
Chlorine exists in two isotopic forms. $\mathrm{Cl}-37$ and $\mathrm{Cl}-35$ but its atomic mass is 35.5. This indicates the ratio of $\mathrm{Cl}-37$ and $\mathrm{Cl}-35$ is approximately
A
$1: 2$
B
$1: 1$
C
$1: 3$
D
$3: 1$
14
MCQ (Single Correct Answer)
The pair of ions having same electronic configuration is ............ .
A
$\mathrm{Cr}^{3+}, \mathrm{Fe}^{3+}$
B
$\mathrm{Fe}^{3+}, \mathrm{Mn}^{2+}+$
C
$\mathrm{Fe}^{3+}, \mathrm{Co}^{3+}$
D
$\mathrm{Sc}^{3+}, \mathrm{Cr}^{3+}$
15
MCQ (Single Correct Answer)
For the electrons of oxygen atom, which of the following statements is correct?
A
$Z_{\text {eff }}$ for an electron in a $2 s$ orbital is the same as $Z_{\text {eff }}$ for an electron in a $2 p$ orbital
B
An electron in the $2 s$ orbital has the same energy as an electron in the $2 p$ orbital
C
$Z_{\text {eff }}$ for an electron in $1 s$ orbital is the same as $Z_{\text {eff }}$ for an electron in a $2 s$ orbital
D
The two electrons present in the $2 s$ orbital have spin quantum numbers $m_s$ but of opposite sign