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 $\mathrm{N}_2$
15
MCQ (Single Correct Answer)
Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron and sulphur, oxides of elements of which of the group $(s)$ are present in the mixture?
A
Group 2
B
Groups 2, 13 and 14
C
Groups 2 and 13
D
Groups 2 and 14