${\mathrm{R}}_3\mathrm{SiCl}$ on complete hydrolysis forms:

1.  ${\mathrm{R}}_3\mathrm{SiOH}$

2.  ${\mathrm{R}}_3\mathrm{Si}—\mathrm{O}—{\mathrm{SiR}}_3$

3.  ${\mathrm{R}}_3\mathrm{Si}=\mathrm{O}$

4.  None of the above.

Pyrosilicate ion is:

1.  ${\mathrm{SiO}}_2^{2-}$

2.  ${\mathrm{SiO}}_4^{2-}$

3.  ${\mathrm{Si}}_2{\mathrm{O}}_7^{6-}$

4.  ${\mathrm{Si}}_2{\mathrm{O}}_6^{7-}$

Semi water gas is a mixture of:

1.  water gas and producer gas

2.  water gas and ${\mathrm{CO}}_2$

3.  producer gas and ${\mathrm{CO}}_2$

4.  producer gas and oil gas

Butter of tin is:

1.  ${\mathrm{SnCl}}_2·5{\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{SnCl}}_4·5{\mathrm{H}}_2\mathrm{O}$

3.  ${\mathrm{SnBr}}_2·2{\mathrm{H}}_2\mathrm{O}$

4.  ${\mathrm{SnBr}}_4·5{\mathrm{H}}_2\mathrm{O}$

Pewter is an alloy of:

1.  Pb and Sn

2.  Pb, Sb and Sn

3.  Pb, Bi and Sn

4.  sb, Sn and Cu,Bi,Pb

Lead pipes can be used for:

1.  soft water

2.  hard water

3.  both hard and soft water

4.  none of the above

Ordinary glass is:

1.  sodium silicate

2.  copper silicate

3.  calcium silicate

4.  a mixture of calcium and sodium silicates with silica

Synthesis gas is a mixture of:

1.  steam and carbon monoxide

2.  carbon monoxide and nitrogen

3.  hydrogen and carbon monoxide

4.  hydrogen and methane

The substance used to impart green colour to glass is:

1.  ${\mathrm{Cu}}_2\mathrm{O}$

2.  $\mathrm{CdS}$

3.  ${\mathrm{MnO}}_2$

4.  ${\mathrm{Cr}}_2{\mathrm{O}}_3$

The percentage of lead in a lead pencil is-

1.  20

2.  0

3.  80

4.  70