8
MCQ (Single Correct Answer)
Number of $$\pi$$ bonds and $$\sigma$$ bonds in the following structure is
A
6, 19
B
4, 20
C
5, 19
D
5, 20
9
MCQ (Single Correct Answer)
Which molecule/ion out of the following does not contain unpaired electrons?
A
$\mathrm{N}_2^{+}$
B
$\mathrm{O}_2$
C
$\mathrm{O}_2^{2-}$
D
$\mathrm{B}_2$
10
MCQ (Single Correct Answer)
In which of the following molecule/ion all the bonds are not equal?
A
$\mathrm{XeF}_4$
B
$\mathrm{BF}_4^{-}$
C
$\mathrm{C}_2 \mathrm{H}_4$
D
$\mathrm{SiF}_4$
11
MCQ (Single Correct Answer)
In which of the following substances will hydrogen bond be strongest?
A
HCl
B
$\mathrm{H}_2 \mathrm{O}$
C
HI
D
$\mathrm{H}_2 \mathrm{S}$
12
MCQ (Single Correct Answer)
If the electronic configuration of an element is $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^2 4 s^2$, the four electrons involved in chemical bond formation will be
A
$3 p^6$
B
$3 p^6, 4 s^2$
C
$3 p^6, 3 d^2$
D
$3 d^2, 4 s^2$