The compound among the following that used in cosmetic surgery is:

1. Silica

2. Silicates

3. Silicones

4. Zeolites

Consider the following reaction

${\mathrm{BF}}_3<mspace\; width="1em"></mspace>\stackrel{{\mathrm{Al}}_2{\mathrm{Cl}}_4}{\to }<mspace\; width="1em"></mspace>\left(\mathrm{A}\right)<mspace\; width="1em"></mspace>\underset{\mathrm{discharged}}{\overset{{\mathrm{H}}_2<mspace\; width="1em"></mspace>-<mspace\; width="1em"></mspace>\mathrm{gas}}{\to }}<mspace\; width="1em"></mspace>\left(\mathrm{B}\right)<mspace\; width="1em"></mspace>\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }<mspace\; width="1em"></mspace>\left(\mathrm{C}\right)$

Select the correct statement.

1.  The compound (A) is ${\mathrm{BCl}}_3$

2.  The compound (C) is ${\mathrm{B}}_2{\mathrm{H}}_6$

3.  The compound (C) is ${\left[{\mathrm{B}}_2{\left(\mathrm{OH}\right)}_4\right]}^{-}$

4.  The compound (B) is ${\mathrm{B}}_2{\mathrm{Cl}}_4$

Tin dissolves in concentrated and dil. ${\mathrm{H}}_2{\mathrm{SO}}_4$ as well as ${\mathrm{HNO}}_3$. Which of the following is not the exact product of this process?

1.  ${\mathrm{SnSO}}_4$

2.  $\mathrm{Sn}{\left({\mathrm{SO}}_4\right)}_2$

3.  $\mathrm{Sn}{\left({\mathrm{NO}}_3\right)}_3$

4.  ${\mathrm{H}}_2{\mathrm{SnO}}_3$  

Boric acid on heating at $150°\mathrm{C}$ gives

1.  ${\mathrm{B}}_2{\mathrm{O}}_3$

2.  ${\mathrm{H}}_2{\mathrm{B}}_4{\mathrm{O}}_7$

3.  ${\mathrm{HBO}}_2$

4.  ${\mathrm{H}}_2{\mathrm{BO}}_3$

Mellitic acid is formed by the oxidation of graphite with -

1. Chromic acid

2. Alkaline ${\mathrm{KMnO}}_4$

3. Fuming ${\mathrm{HNO}}_3$

4. dil. ${\mathrm{HNO}}_3$

Incorrect option about 2-D sheet silicates is

1.  Two O-atoms of each tetrahedron are shared

2.  General formula is ${\left({\mathrm{Si}}_2{\mathrm{O}}_5\right)}_{\mathrm{n}}^{2\mathrm{n}-}$

3.  Co-ordination number of Si is 4

4.  Number of O-atoms per tetrahedra unit is $\frac{5}{2}$

Colemanite mineral is

1.  ${\mathrm{Ca}}_2{\mathrm{B}}_6{\mathrm{O}}_{11}5{\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{CaB}}_4{\mathrm{O}}_7.{\mathrm{NaBO}}_{2}8{\mathrm{H}}_2\mathrm{O}$

3.  $2{\mathrm{Mg}}_3{\mathrm{B}}_8{\mathrm{O}}_{15}{\mathrm{MgCl}}_2$

4.  ${\mathrm{Ca}}_2{\mathrm{B}}_6{\mathrm{O}}_{11}.3{\mathrm{H}}_2\mathrm{O}$

Hydrolysis of ${\mathrm{SiF}}_4$ gives a compound, in which maximum coordination number of Si is

1.  6

2.  4

3.  8

4.  7

${\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4\stackrel{\mathrm{\Delta }}{⟶}\mathrm{Gas}\left(\mathrm{A}\right)+\mathrm{Gas}\left(\mathrm{B}\right)+\mathrm{liquid}\left(\mathrm{C}\right)$.

Gas (A) burns with blue flame and it oxidised to (B)
$\mathrm{Gas}\left(\mathrm{A}\right)+{\mathrm{CI}}_2⟶\left(\mathrm{D}\right)<mspace\; width="1em"></mspace>\underset{△}{\overset{{\mathrm{NH}}_3}{\to }},\left(\mathrm{E}\right)$

A, B, C and E are respectively

1.  $\mathrm{CO},<mspace\; width="1em"></mspace>{\mathrm{CO}}_2,<mspace\; width="1em"></mspace>{\mathrm{COCl}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{HCONH}}_2$

2.  $\mathrm{CO},<mspace\; width="1em"></mspace>{\mathrm{CO}}_2,<mspace\; width="1em"></mspace>H_{2}O,<mspace\; width="1em"></mspace>{\mathrm{COCl}}_2$

3.  ${\mathrm{CO}}_2,<mspace\; width="1em"></mspace>\mathrm{CO},<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O},<mspace\; width="1em"></mspace>{\mathrm{HCONH}}_2$

4.  $\mathrm{CO},<mspace\; width="1em"></mspace>{\mathrm{CO}}_2,<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O},<mspace\; width="1em"></mspace>{\mathrm{NH}}_2{\mathrm{CONH}}_2$

The most volatile compound among the following is -

1.  ${\mathrm{CH}}_4$

2.  ${\mathrm{SiH}}_4$

3.  ${\mathrm{GeH}}_4$

4.  ${\mathrm{SnH}}_4$