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
$3 d^2, 4 s^2$
13
MCQ (Single Correct Answer)
Which of the following angle corresponds to sp$$^2$$ hybridisation?
A
90$$^\circ$$
B
120$$^\circ$$
C
180$$^\circ$$
D
109$$^\circ$$
14
MCQ (Single Correct Answer)
$$\begin{array}{llllll} A & 1 s^2 & 2 s^2 & 2 p^6 & & \\ B & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^3 \\ C & 1 s^2 & 2 s^2 & 2 p^6 & 3 s^2 & 3 p^5 \end{array}$$
Stable form of $A$ may be represented by the formula
A
$A$
B
$A_2$
C
$A_3$
D
$A_4$