10
MCQ (Single Correct Answer)
In the structure of diborane,
A
All hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane
B
2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane
C
4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane
D
All the atoms in the same plane
11
MCQ (Single Correct Answer)
A compound X , of boron reacts with $\mathrm{NH}_3$ on heating to give another compound $Y$ which is called inorganic benzene. The compound $X$ can be prepared by treating $\mathrm{BF}_3$ with lithium aluminium hydride. The compounds $X$ and $Y$ are represented by the formulas.
A
$\mathrm{B}_2 \mathrm{H}_6, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6$
B
$\mathrm{B}_2 \mathrm{O}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6$
C
$\mathrm{BF}_3, \mathrm{~B}_3 \mathrm{~N}_3 \mathrm{H}_6$
D
$\mathrm{B}_3 \mathrm{~N}_3 \mathrm{H}_6, \mathrm{~B}_2 \mathrm{H}_6$
12
MCQ (Single Correct Answer)
Quartz is extensively used as a piezoelectric material, it contains .......... .
A
Pb
B
Si
C
Ti
D
Sn
13
MCQ (Single Correct Answer)
The most commonly used reducing agent is
A
$\mathrm{AlCl}_3$
B
$\mathrm{PbCl}_2$
C
$\mathrm{SnCl}_4$
D
$\mathrm{SnCl}_2$
14
MCQ (Single Correct Answer)
Dry ice is
A
solid $\mathrm{NH}_3$
B
solid $\mathrm{SO}_2$
C
solid $\mathrm{CO}_2$
D
solid $\mathrm{N}_2$