Solid State Test

Result

Solid State Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Which crystal system does the unit cell dimensions, $$a\neq b\neq c$$ and $$\alpha= \beta= \gamma$$ represent?

A
Cubic

B
Orthorhombic

C
Tetragonal

D
Trigonal

Solution

$$a \neq b \neq c $$

$$\alpha=\beta=\gamma=90^{\circ}$$

3 types:-

1. Body centred orthorhombic: lattice point in middle of unit cell.

2. Base centerd: lattice point in middle of each of 2 ends.

3. Face centred = middle of each side.
Question 2
1 / -0

Sodium chloride crystal has a ________ shape.

A
Definite

B
Regular

C
Irregular

D
None of these

Solution

In $$NaCl$$ crystal, there exists strong ionic bonding between $$Na^{+}$$ and $$Cl^{-}$$ ions. Because of stronger forces of attraction between $$Na^{+}$$ and $$Cl^{-}$$, they remain fixed at their positions, thus, arranging in a definite pattern to give a definite shape.
Question 3
1 / -0

Pick out the crystalline substance from the following.

A
Coal

B
Wax

C
Clay

D
Sugar

Solution

In sugar, the constituent particles are arranged in a specific manner. Hence, it is a crystalline solid.

In coal, wax, and clay the constituent particles are arranged in a random manner. Hence, it is an amorphous solid.

Hence, the correct option is $$\text{D}$$
Question 4
1 / -0

Which of the following is an amorphous substance?

A
Zinc

B
Clay

C
Salt

D
Sugar

Solution

In clay, the constituent particles are arranged in a random manner. Hence, it is a amorphous solid.
In zinc, salt and sugar the constituent particles are arranged in a specific manner. Hence, it is a crystalline solid.
Question 5
1 / -0

The space lattice of graphite is:

A
cubic

B
tetragonal

C
rhombic

D
hexagonal

Solution

The structure of graphite consists of many flat layers of hexagons. The layers are called graphene sheets. Each carbon atom in the layer is joined by strong covalent bonds to only three other carbon atoms. Compare this with the structure of diamond. Each graphene sheet is itself a giant molecule.
Question 6
1 / -0

Identify the crystalline solid among the following :

A
Glass

B
Carbon black

C
Resin

D
Silver

Solution

Th e solid which have fixed composition and three dimensional structure is called as crystalline solid. Silver is a crystalline solid because it have fixed composition and structure .
Question 7
1 / -0

Suppose the mass of a single $$Ag-$$atom is $$m$$. $$Ag$$ metal crystallizes in fcc lattice with unit cell of length $$a$$. The density of $$Ag$$ metal in terms of $$a$$ and $$m$$ is:

A
$$\dfrac{4m}{a^3}$$

B
$$\dfrac{2m}{a^3}$$

C
$$\dfrac{m}{a^3}$$

D
$$\dfrac{m}{4a^3}$$

Solution

Edge length of the unit cell is $$a$$
Volume of the unit cell is $$\displaystyle a^3$$
One fcc unit cell contains $$4 Ag$$ atoms.
Mass of one $$Ag$$ atom is $$m$$.
Mass of $$4 Ag$$ atoms is $$4m$$.
Density $$\displaystyle = \dfrac {mass}{volume} = \dfrac {4m}{a^3} $$
Question 8
1 / -0

The third layer in Figure - B:

A
lie on tetrahedral voids of $$2^{nd}$$ layer

B
lie on octaheadral voids of $$2^{nd}$$ layer

C
both $$A$$ and $$B$$

D
none of the above

Solution

This is an example of a ABAB type packing or the hexagonal closed packing wherein the second row is placed above the first row in such a manner that it fits in the depressions of the first row(tetrahedral voids) and similariy the third layers lie on the tetrahedral voids of the second
Question 9
1 / -0

Which metal among the following has the highest packing efficiency?

A
Iron

B
Tungsten

C
Aluminium

D
Polonium

Solution

The packing efficiency is is the fraction of volume in a crystal structure that is occupied by constituent particles (volume of space occupied by the spheres/total volume). The majority of metals take on either the hcp or bcc structure. Among the given metals $$Al$$ occupies hexagonal close-packed (hcp) is having 0.74 packing efficiency and other metals form body-centered cubic (bcc) which has 0.68 packing efficiency.
Question 10
1 / -0

Which among the following solids crystallises as a face centred cube?

A
Iron

B
Rubidium

C
Uranium

D
Platinum

Solution

S.No. Element Type of packing
A Fe bcc
B Rb bcc
C U bcc
D Pt fcc

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S.No.	Element	Type of packing
A	Fe	bcc
B	Rb	bcc
C	U	bcc
D	Pt	fcc

Solid State Test - 33

Result

Solid State Test - 33

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Question 1

Cubic

Orthorhombic

Tetragonal

Trigonal

Solution

Question 2

Definite

Regular

Irregular

None of these

Solution

Question 3

Coal

Wax

Clay

Sugar

Solution

Question 4

Zinc

Clay

Salt

Sugar

Solution

Question 5

cubic

tetragonal

rhombic

hexagonal

Solution

Question 6

Glass

Carbon black

Resin

Silver

Solution

Question 7

$$\dfrac{4m}{a^3}$$

$$\dfrac{2m}{a^3}$$

$$\dfrac{m}{a^3}$$

$$\dfrac{m}{4a^3}$$

Solution

Question 8

lie on tetrahedral voids of $$2^{nd}$$ layer

lie on octaheadral voids of $$2^{nd}$$ layer

both $$A$$ and $$B$$

none of the above

Solution

Question 9

Iron

Tungsten

Aluminium

Polonium

Solution

Question 10

Iron

Rubidium

Uranium

Platinum

Solution

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