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

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

The most volatile compound among the following is -

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 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-