Under hydrolytic conditions, the compounds used for the preparation of the linear polymer and for chain termination, respectively, are

1.  ${\mathrm{CH}}_3{\mathrm{SiCl}}_3<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>\mathrm{Si}{\left({\mathrm{CH}}_3\right)}_4$

2.  ${\left({\mathrm{CH}}_3\right)}_2{\mathrm{SiCl}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3\right)}_3\mathrm{SiCl}$

3.  ${\left({\mathrm{CH}}_3\right)}_2{\mathrm{SiCl}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{SiCl}}_3$

4.  ${\mathrm{SiC}}_4<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3\right)}_3\mathrm{SiCl}$

${\mathrm{Na}}_2{\mathrm{B}}_4{\mathrm{O}}_7\cdot 10{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>\underset{∆}{\overset{{740}^{\circ }\mathrm{C}}{\to }}<mspace\; width="1em"></mspace>2{\mathrm{NaBO}}_2+\left(\mathrm{X}\right)+10{\mathrm{H}}_2\mathrm{O}$
$\left(\mathrm{X}\right)+{\mathrm{CaF}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4⟶\mathrm{Y}+{\mathrm{CaSO}}_4+{\mathrm{H}}_2\mathrm{O}$
$\left(\mathrm{Y}\right)+{\mathrm{NaBH}}_4⟶\left(\mathrm{Z}\right)+{\mathrm{NaBF}}_4$

Select the incorrect statement regarding compounds (X), (Y) and (Z).

1.  Compound (X) is ${\mathrm{B}}_2{\mathrm{O}}_3$ and compound (Z) contains two 3C - 2e bonds

2.  Compound (X) is ${\mathrm{B}}_2{\mathrm{O}}_3$ and compound (Y) contains one 3C - 2e bonds 

3.  Compound (Y) is Lewis acid and stable due to $p\pi -p\pi$ back bonding

4.  Compound (Z) reacts with excess of ${\mathrm{NH}}_3$ at high temperature gives inorganic graphite 

Which element does not form alum?

1.  Fe

2.  Li

3.  K

4.  Al

The major products obtained in the reaction of oxalic acid with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ upon heating are

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

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

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

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

${\mathrm{Al}}_2{\mathrm{O}}_3$ reacts with 

1.  Only water

2.  Only acids

3.  Only alkalis

4.  Both acids and alkalis

Find the products formed when NaBH₄ is oxidised by I₂.

In the structure of borax, the numbers of boron atoms and B-O-B units, respectively, are

1.  4 and 5

2.  4 and 3

3.  5 and 4

4.  5 and 3

BCl₃ undergoes hydrolysis to form compound X, which reacts with
sodium carbonate to produce compound Y.
Identify X and Y, respectively.

1. H₃BO₃ and NaBO₂

2. H₃BO₃ and Na₂B₄O₇

3. B₂O₃ and NaBO₂

4. B₂O₃ and Na₂B₄O₇

The element that combines with oxygen to give an amphoteric oxide is

1. N

2. P

3. Al

4. Na

The Lewis acid strength of ${\mathrm{BBr}}_3$, ${\mathrm{BCl}}_3$ and ${\mathrm{BF}}_3$ is the order 

1.  ${\mathrm{BBr}}_3$ < ${\mathrm{BCl}}_3$ < ${\mathrm{BF}}_3$

2.  ${\mathrm{BCl}}_3$ < ${\mathrm{BF}}_3$ < ${\mathrm{BBr}}_3$

3.  ${\mathrm{BF}}_3$ < ${\mathrm{BCl}}_3$ < ${\mathrm{BBr}}_3$

4.  ${\mathrm{BBr}}_3$ < ${\mathrm{BF}}_3$ < ${\mathrm{BCl}}_3$