CO₂ and N₂ are non-supporters of combustion. However, for putting out fires CO₂ is preferred over N₂ because CO₂:

1. Does not burn.

2. Forms non-combustible products with burning substances.

3. Is denser than nitrogen.

4. Is a more reactive gas.

$CC{l}_4$ does not show hydrolysis but $SiC{l}_4$ is readily hydrolysed because:

(1) carbon cannot expand its octet but silicon can expand.

(2) electronegativity of carbon is higher than of silicon

(3) IP of carbon is higher than of silicon

(4) carbon forms double and triple bonds but not silicon

Quartz is made of silicon and oxygen joined in a network arrangement that is similar to:

1. Diamond

2. Graphite

3. $O_2$

4. None of the above

$R_{3}SiCl$ on polymerisation after hydrolysis forms:

(1) $R_{3}SiOH$

(2) $R_{3}Si-O-Si{R}_3$

(3) $R_{2}Si=O$

(4) None of these

The basic reaction involved in the synthesis of linear silicones is:

(1) the hydrolysis of trimethyl chlorosilane

(2) the hydrolysis of dimethyl dichlorosilane

(3) the hydrolysis of ethyl chlorosilane

(4) the acid hydrolysis of dimethyl silane

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:

(1) $R_{4}Si$

(2) $RSiC{l}_3$

(3) $R_{2}SiC{l}_2$

(4) $R_{3}SiCl$

When ${\mathrm{SnCl}}_2$ reacts with ${\mathrm{HgCl}}_2$, the product formed is-

1. $\mathrm{Sn}+{\mathrm{HgCl}}_4$

2. $\mathrm{Sn}+{\mathrm{Cl}}_2+{\mathrm{Hg}}_2{\mathrm{Cl}}_2$

3. ${\mathrm{SnCl}}_4<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{Hg}}_2{\mathrm{Cl}}_2$

4. None of the above

The amphoteric oxide among the following is -

Aluminium chloride in acidified aqueous solution forms a complex 'A'.
The formula of A and hybridisation state of Al in 'A' is respectively:

1. [Al(H₂O)₆]³⁺, sp³d²

2. [Al(H₂O)₄]³⁺, sp³

3. [Al(H2O)4]3+, dsp2

4. [Al(H₂O)]³⁺, d²sp³

 Which among the following is a gas?

1. $B{F}_3$

2. $BC{l}_3$

3. $BB{r}_3$

4. $B{I}_3$