Question

Match the column A (type of crystalline solid) with the column B (example for each type) :

A		B
P.	Molecular Solid	i.	SiC
Q.	Ionic Solid	ii.	Mg
R.	Metallic Solid	iii.	H2O
S.	Network Solid	iv.	MgO

• A. P-iii, Q-i, R-ii, S-iv
• B. P-iv, Q-iii, R-ii, S-i
• C. P-ii, Q-iv, R-iii, S-i
• D. P-iii, Q-iv, R-ii, S-i

Answer 1

The Correct Option is D

Let's match the types of crystalline solids (Column A) with suitable examples (Column B): 

Detailed Explanation:

• Molecular Solid (P):
  • Example: H₂O (ice), molecules held by intermolecular hydrogen bonds (van der Waals forces).
• Ionic Solid (Q):
  • Example: MgO (magnesium oxide), ions held by electrostatic forces.
• Metallic Solid (R):
  • Example: Mg (magnesium metal), metal atoms surrounded by a "sea of electrons".
• Network Solid (S):
  • Example: SiC (silicon carbide), atoms connected by covalent bonds in an extensive network.

Matched pairs:

• P → H₂O (iii)
• Q → MgO (iv)
• R → Mg (ii)
• S → SiC (i)

Conclusion:

The correct matched set is:

P-iv, Q-iii, R-ii, S-i, which corresponds to Option (B).

Correct Answer: Option (B)

Answer 2

Molecular Solid (P): Molecular solids consist of molecules held together by intermolecular forces. Water (H₂O) is a molecular solid, as it forms ice at lower temperatures. Hence, P matches with iii (H₂O). 

Ionic Solid (Q): Ionic solids are made up of positively and negatively charged ions held together by ionic bonds. Magnesium oxide (MgO) is an ionic solid. Hence, Q matches with iv (MgO).

Metallic Solid (R): Metallic solids consist of metal atoms arranged in a lattice with delocalized electrons, which is typical for metals like magnesium (Mg). Hence, R matches with ii (Mg).

Network Solid (S): Network solids have a network of atoms held together by covalent bonds, such as silicon carbide (SiC). Hence, S matches with i (SiC). 

Therefore, the correct answer is \((D): P-iii, Q-iv, R-ii, S-i\).