Types of Crystalline Solids

Q. Graphite in an example of:

1. van der Waal’s Crystal
2. Covalent Solid
3. Ionic Solid
4. Metallic Crystal

Q. Match the following:

$\begin{array}{cc}ColumnI& ColumnII\\ \left(1\right)HCl& \left(i\right)PolarMolecularsolid\\ \left(2\right)Ice& \left(ii\right)Non-polarMolecularsolid\\ \left(3\right)CC{l}_4& \left(iii\right)H-bondedMolecularsolid\end{array}$

1. (1)-(ii), (2)-(iii), (3)-(i)

2. (1)-(i), (2)-(iii), (3)-(ii)

3. (1)-(i), (2)-(ii), (3)-(iii)

4. (1)-(iii), (2)-(ii), (3)-(i)

Q.

Which of the following is/are molecular solid(s)?

1. Iron (Fe)

2. Solid SO₂

3. CaF₂

4. Diamond

Q.

Match the following:

$\begin{array}{cc}ColumnI& ColumnII\\ \left(1\right).Non-polarMolecularsolids& \left(i\right)Coulombicorelectrostaticforces\\ \left(2\right).H-BondedMolecularsolids& \left(ii\right).H-bonding\\ \left(3\right).Ionicsolids& \left(iii\right).Metallicbonding\\ \left(4\right).Weakdispersionforces& \left(iv\right).Weakdispersionforces\\ \left(5\right).Metallicsolids& \left(v\right).dipole–dipoleinteraction.\\ & \left(vi\right).covalentBonding.\end{array}$

1. (1)-(iv), (2)-(ii), (3)-(iv), (4)-(vi), (5)-(iii)

2. (1)-(iv), (2)-(ii), (3)-(i), (4)-(vi), (5)-(iii)

3. (1)-(iv), (2)-(ii), (3)-(iv), (4)-(vi), (5)-(iii)

4. (1)-(v), (2)-(i), (3)-(iv), (4)-(vi), (5)-(ii)

Q.

LiF is an example of

1. covalent crystal

2. metallic crystal

3. ionic crystal

4. molecular crystal

Q. Match the following type of solids with forces between the molecules

1. Electrostatic force
2. Metallic bonding
3. $\mathrm{Dipole}-\mathrm{dipole}\mathrm{interaction}$
4. Covalent bonding

Q. Ammonium chloride crystallises in a body centered cubic lattice with a unit distance of $386pm$. Calculate the radius (in pm) of $N{H}_4^{+}$ ion. If the radius of $C{l}^{-}$ ion is $181pm$
$(Take\sqrt{3}=1.73)$

Q.

Which of the following is not the characteristic of ionic solids ?

(a) Very low value of electrical conductivity in the molten state

(b) Brittle nature

(c) Very strong forces of interactions

(d) Anisotropic nature

Q.

Explain

(i) The basis of similarities and differences between metallic and ionic crystals.

(ii) Ionic solids are hard and brittle.

Q.

Which of the following cannot be regarded as molecular solid ?

(a)SIC (silicon carbide) (b) AIN

(c) Diamond (d) $I_2$