Solid State Test

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Solid State Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Diamond shows ___________ lusture.

A
adamantine

B
resinous

C
pearly

D
translucent

Solution

Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. Adamantine minerals possess a superlative lustre, which is most notably seen in diamond. Such minerals are transparent or translucent, and have a high refractive index (of 1.9 or more). Minerals with a true adamantine lustre are uncommon.
Question 2
1 / -0

Which of the following compounds would be a white, crystalline solid?

A
$$\displaystyle { C }_{ 3 }{ H }_{ 8 }$$

B
$$\displaystyle CO$$

C
$$\displaystyle Cu{ Cl }_{ 2 }$$

D
$$\displaystyle { Cr }_{ 2 }{ O }_{ 3 }$$

E
$$\displaystyle MgO$$

Solution

Option $$E$$ is the correct answer.
Magnesium Oxide is an ionic compound, formed by the transfer of electrons from one element to the other. Since it is an ionic compound, $$MgO$$ is solid. It is also white and crystalline in nature.
Question 3
1 / -0

The space lattice of diamond is:

A
fcc

B
bcc with two atoms per unit cell

C
bcc with 4 atoms per unit cell

D
simple cubic

Solution

The diamond lattice consists of a face-centred cubic Bravais point lattice which contains two identical atoms per lattice point.
The distance between the two atoms equals one-quarter of the body diagonal of the cube. The diamond lattice represents the crystal structure of diamond, germanium and silicon.
The diamond lattice contains also 4 lattice point per unit cell but contains 8 atoms per unit cell tetrahedrally bonded atoms in each primitive cell.
Question 4
1 / -0

Identify the system of crystal structure, if a = b $$\neq$$ c and $$\alpha = \beta = 90^{\circ}$$ and $$\gamma = 120^{\circ}$$

A
Monoclinic

B
Triclinic

C
Hexagonal

D
Rhombohedral

Solution

In the hexagonal system, there is an axes with six-fold rotation symmetry. Just as in the trigonal system, if we chose this axis to be along the c direction, then we have $$a = b ≠ c$$,$$\ α=β=90^∘$$, $$γ=120^∘$$. There is only one lattice in the hexagonal system.

Hence, the correct option is $$C$$
Question 5
1 / -0

The edge length of the NaCl unit cell is if radius of $$Na^+$$ is 97 pm and radius of it is 181 pm :

A
556 pm

B
278 pm

C
139 pm

D
120 pm

Solution

for NaCl type structure
$$2(r_-+r_+)=a$$
$$2(97+181) = a$$
$$\therefore a=2\times 278pm$$
$$\therefore a=556pm$$
a is edge length
Question 6
1 / -0

Solids with regular pattern are called______and irregular pattern are called_______.

A
crystalline, amorphous

B
amorphous, crystalline

C
amorphous, metallic

D
non-metallic, crystalline

Solution

In crystalline solids, the atoms, ions or molecules are arranged in an ordered and symmetrical pattern that is repeated over the entire crystal. However, no such symmetry or pattern is observed in amorphous solid.
Question 7
1 / -0

Total number of layer between a distance of $$14R \sqrt { \frac { 2 }{ 3 } } $$ in help unit cell ?

A
5

B
8

C
6

D
None of these

Solution

(Refer to Image)
In a distance of $$h=4r \sqrt {\cfrac {2}{3}}$$, there are $$3$$ layers.
Hence in a distance of $$h=14r\sqrt {\cfrac {2}{3}}$$, there will be approximately $$10$$ layers.
Question 8
1 / -0

Empty space in ccp lattice is

A
$$26$$%

B
$$45$$%

C
$$90$$%

D
$$30$$%

Solution

In ccp lattice $$74$$% of the space is occupied by spheres and $$26$$% is empty.
Question 9
1 / -0

Packing fraction in a body-centred cubic cell of crystals is

A
$$\frac{{\sqrt 3 }}{8}\pi $$

B
$$\frac{\pi }{6}$$

C
$$\frac{{\sqrt 2 }}{6}\pi $$

D
$$\frac{1}{{2\sqrt 2 }}\pi $$

Solution
Question 10
1 / -0

Lattice energy is defined as the energy released when 1 mol of an ionic solid is formed from its ions in the gaseous phase. From the following given compounds, the lattice energy is maximum for (compare the only magnitude)

A
$$N{a_2}O$$

B
NaF

C
$$Mg{F_2}$$

D
$$MgC{l_2}$$

Solution

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Re-Attempt Weekly Quiz Competition

Solid State Test - 18

Result

Solid State Test - 18

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SHARING IS CARING

Question 1

adamantine

resinous

pearly

translucent

Solution

Question 2

$$\displaystyle { C }_{ 3 }{ H }_{ 8 }$$

$$\displaystyle CO$$

$$\displaystyle Cu{ Cl }_{ 2 }$$

$$\displaystyle { Cr }_{ 2 }{ O }_{ 3 }$$

$$\displaystyle MgO$$

Solution

Question 3

fcc

bcc with two atoms per unit cell

bcc with 4 atoms per unit cell

simple cubic

Solution

Question 4

Monoclinic

Triclinic

Hexagonal

Rhombohedral

Solution

Question 5

556 pm

278 pm

139 pm

120 pm

Solution

Question 6

crystalline, amorphous

amorphous, crystalline

amorphous, metallic

non-metallic, crystalline

Solution

Question 7

5

8

6

None of these

Solution

Question 8

$$26$$%

$$45$$%

$$90$$%

$$30$$%

Solution

Question 9

$$\frac{{\sqrt 3 }}{8}\pi $$

$$\frac{\pi }{6}$$

$$\frac{{\sqrt 2 }}{6}\pi $$

$$\frac{1}{{2\sqrt 2 }}\pi $$

Solution

Question 10

$$N{a_2}O$$

NaF

$$Mg{F_2}$$

$$MgC{l_2}$$

Solution

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