Borax bead test is responded by:

1.  Divalent metals

2.  Heavy metals

3.  Light metals

4.  Metal which forms coloured metaborates

Reactivity of borazole is greater than that of benzene because:

1.  borazole is non-polar compound

2.  borazole is polar compound

3.  borazole is electron deficient compound

4.  of localized electron in it

Inorganic benzene is:

1. $\mathrm{BN}$

2. ${\mathrm{BF}}_4$

3. ${\mathrm{B}}_2{\mathrm{H}}_6$

4. ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

Diborane does not undergo cleavage reaction with:

1.  trimethyl amine

2.  ammonia

3.  $\mathrm{CO}$

4.  ${\mathrm{CO}}_2$

Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that ${\mathrm{BF}}_3$ has no dipole moment but ${\mathrm{PF}}_3$ has?

1.  ${\mathrm{BF}}_3$ is spherically symmetrical, ${\mathrm{PF}}_3$ is not

2.  ${\mathrm{BF}}_3$ molecule must be linear

3.  The atomic radius of P is larger than the atomic radius of B

4.  The ${\mathrm{BF}}_3$ molecule must be planar triangular

Borazine is obtained by reaction of:

1.  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 2 : 1 \mathrm{ratio}$

2.  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 1 : 2 \mathrm{ratio}$

3.  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 1 : 4 \mathrm{ratio}$

4.  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 4 : 1 \mathrm{ratio}$

Boric acid is not used:

1. As an antiseptic

2. As a flux in soldering

3. In making optical glasses

4. In making enamels and pottery glazes

An incorrect statement among the following regarding Al₂Cl₆ is:

Heating an aqueous solution of aluminium chloride to dryness will give:

1.  ${\mathrm{AlCl}}_3$

2.  ${\mathrm{Al}}_2{\mathrm{Cl}}_6$

3.  ${\mathrm{Al}}_2{\mathrm{O}}_3$

4.  $\mathrm{Al}\left(\mathrm{OH}\right){\mathrm{Cl}}_2$

Carbon dioxide is a gas but silica is a solid because:

1.  carbon dioxide is composed of discrete covalent ${\mathrm{CO}}_2$ molecules whereas silica has continuous

     tetrahedral structure

2.  ${\mathrm{CO}}_2$ molecules are lighter than ${\mathrm{SiO}}_2$ molecules

3.  ${\mathrm{CO}}_2$ is more acidic than ${\mathrm{SiO}}_2$

4.  melting point of silica is very high