Quartz is extensively used as a piezoelectric material, it contains-

1.  Pb

2.  Si

3.  Ti

4.  Sn

The most commonly used reducing agent among the following is :

1. AlCl₃ 

2. PbCl₂

3. SnCl₄

4. SnCl₂

Dry ice is-

1. Solid NH₃

2. Solid SO₂

3. Solid CO₂

4. Solid N₂

Cement, the important building material is a mixture of oxides of several elements. Besides calcium, iron, and sulphur oxides of elements of which of the group(s) are present in the mixture?

1. Group 2

2. Groups 2, 13, and 14

3. Groups 2, and 13

4. Groups 2, and 14

The reason for the small radius of Ga compared to Al is-.

a.  Poor screening effect of d and f orbitals

b.  Increase in nuclear charge

c.  Presence of higher orbitals

d.  Higher atomic number

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The linear shape of CO₂ is due to _______.

a.  sp³ hybridisation of carbon

b.  sp hybridisation of carbon

c.  $\mathrm{p\pi }-\mathrm{p\pi }$ bonding between carbon and oxygen

d.  sp² hybridisation of carbon

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Me₃SiCl is used during polymerization of organ silicones because

a.  Chain length of organic silicone polymers can be controlled by adding ${\mathrm{Me}}_3\mathrm{SiCl}$

b.  ${\mathrm{Me}}_3\mathrm{SiCl}$ blocks the end terminal of silicone polymer

c.  ${\mathrm{Me}}_3\mathrm{SiCl}$ improves the quality and yield of the polymer

4.  ${\mathrm{Me}}_3\mathrm{SiCl}$ acts as a catalyst during polymerization

Choose the correct option

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The correct statements among the following are-

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Which of the following statements are correct?

(Answer on the basis of the given figure.)

Choose the correct option

1. (a, b, c)
2. (b, c, d)
3. (a, c, d)
4. (a, b, d)

Match the species given in Column I with the properties mentioned in Column II.

Codes