Given below are two statements: 

Assertion (A):	If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge.
Reason (R):	Aluminium is trivalent while silicon is tetravalent.

   

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

Given below are two statements: 

Match the species in Column-I with their corresponding hybridisation in Column-II:

Codes:

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

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

Codes:

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)

The correct statements among the following are:

1. a and b
2. b and c
3. c and d
4. a and d

Me₃SiCl is used during polymerization of organ silicones because

Choose the correct option:

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)

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)