The correct formula of 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)
$\mathrm{Gas}\left(\mathrm{A}\right)+{\mathrm{CI}}_2⟶\left(\mathrm{D}\right) \underset{△}{\overset{{\mathrm{NH}}_3}{\to }},\left(\mathrm{E}\right)$

A, B, C and E are respectively

1.  $\mathrm{CO}, {\mathrm{CO}}_2, {\mathrm{COCl}}_2 \mathrm{and} {\mathrm{HCONH}}_2$

2.  $\mathrm{CO}, {\mathrm{CO}}_2, H_{2}O, {\mathrm{COCl}}_2$

3.  ${\mathrm{CO}}_2, \mathrm{CO}, {\mathrm{H}}_2\mathrm{O}, {\mathrm{HCONH}}_2$

4.  $\mathrm{CO}, {\mathrm{CO}}_2, {\mathrm{H}}_2\mathrm{O}, {\mathrm{NH}}_2{\mathrm{CONH}}_2$

Which among ${\mathrm{CH}}_4$, ${\mathrm{SiH}}_4$, ${\mathrm{GeH}}_4$ and ${\mathrm{SnH}}_4$ is most volatile?

1.  ${\mathrm{CH}}_4$

2.  ${\mathrm{SiH}}_4$

3.  ${\mathrm{GeH}}_4$

4.  ${\mathrm{SnH}}_4$

Borazine is called inorganic benzene. It has a ring structure with alternate BH and NH groups. Which of the following statements is not correct about borazine?

1.  Each B and N atom is $s{p}^2$ hybridized

2.  Borazine satisfies the (4n + 2)$\pi$ electrons Huckel's rule

3.  Like organic benzene, borazine does not give addition product with HCI

4.  Borazine contains dative p$\pi$ - p$\pi$ bond

The incorrect statement for orthoboric acid is

1.  It can not be titrated satisfactorily with NaOH, as a sharp endpoint is not obtain

2.  The acidity of its aqueous solution increases upon the addition of ethylene glycol

3.  It is a weak electrolyte in water

4.  It has a three-dimensional structure due to hydrogen bonding

The coordination number of Al in aluminates is:

1.  3

2.  6

3.  1

4.  4

Which of the following oxide is mixed oxide?

1.  ${\mathrm{PbO}}_2$

2.  ${\mathrm{SnO}}_2$

3.  ${\mathrm{Pb}}_2{O}_3$

4.  ${\mathrm{Pb}}_3{O}_4$

Select the correct statement(s) regarding the following reaction sequence

1.  The compound (A) is ${\left({\mathrm{CH}}_3\right)}_2{\mathrm{SiCl}}_2$

2.  The compound D is SiC

3.  The compound (B) is ${\left({\mathrm{CH}}_3\right)}_2\mathrm{Si}{\left(\mathrm{OH}\right)}_2$

4.  All of these 

The number of double bonds at alternate position in ${\mathrm{C}}_{60}$ molecule are

1.  20

2.  25

3.  30

4.  36