Given below are two statements:

Assertion (A):	If aluminium atoms replace a few silicon atoms in a 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 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:

The correct order of ease of hydrolysis is-

1. CCl₄ < SiCl₄ < PCl₅ < AlCl₃

2. AlCl₃ < CCl₄ < PCl₅ < SiCl₄

3. CCl₄ < AlCl₃ < PCl₅ < SiCl₄

4. CCl₄ < AlCl₃ < SiCl₄ < PCl₅

Dry ice is -

1. Solid NH₃

2. Solid SO₂

3. Solid CO₂

4. Solid N₂

The reason behind carbon showing catenation property but lead does not is:

1. Due to the smaller size of C than that of Pb

2. Due to the smaller size of Pb than that of C

3. Due to the smaller ionization energy of C than that of Pb

4. Due to the inert pair effect

Identify the correct statements among the following:

1. (a) and (c) only

2. (b) and (c) only

3. (c) and (d) only

4. (a), (b) and (c) only

BCl₃  has higher stability than ${\mathrm{TlCl}}_3$, because -

Boron trifluoride behaves as a Lewis acid because -

1. Boron trifluoride is electron-rich.

2. Boron trifluoride is electron-deficient.

3. Boron trifluoride is highly stable.

4. None of these.