Solid State Test

Result

Solid State Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

Edge length of a cube is 400 pm, its body diagonal would be

A
500 pm

B
600 pm

C
566 pm

D
693 pm

Solution
Question 2
1 / -0

ZnS crystallises in a cubic structure in which $$Zn^{2+}_{ions}$$ occupy half of tetrahedral voids while $$S^{2 -}$$ ions occupy all corners and face centres. Hence the number of ZnS molecules present in 4 unit cells are

A
12

B
16

C
18

D
24

Solution
Question 3
1 / -0

Which of the following has highest lattice energy?

A
NaCl

B
$$MgCl_2$$

C
KCl

D
$$BaCl_2$$

Solution
Question 4
1 / -0

The pycnometric density of sodium chloride crystal is $$2.165 \times 10^3$$ $$kg m^{-3}$$ while its X-ray density is $$2.178 \times 10^3 kg m^{-3}$$. The fraction of the unoccupied sites in sodium chloride crystal is

A
$$5.96$$

B
$$5.96 \times 10^{-2}$$

C
$$5.96 \times 10^{-1}$$

D
$$5.96 \times 10^{-3}$$

Solution
Question 5
1 / -0

How many unit cells of KBr are present in a 1.00$${ mm }^{ 3 }$$ grain of KBr,KBr crystallizes in NaCl type of crystal lattice and its density is 2.75g/$${ cm }^{ 3 }$$?

A
3.6$$\times \quad { 10 }^{ 18 }$$

B
3.6$$\times \quad { 10 }^{ 19 }$$

C
4.2$$\times \quad { 10 }^{ 18 }$$

D
4.2$$\times \quad { 10 }^{ 19 }$$

Solution
Question 6
1 / -0

The number of lattice points at the centre of the primitive unit cell is

A
1

B
2

C
3

D
0

Solution
Question 7
1 / -0

If the radius of metal atom is 1.00 angstrom and its crystal structure is simple cubic, then what is the volume of one unit cell?

A
$$8\times 10^{-24}m^3$$

B
$$4\times 10^{-30}cm^3$$

C
$$8\times 10^{-30}m^3$$

D
$$2\times 10^{-23}cm^3$$

Solution
Question 8
1 / -0

A metallic element crystallises in face centred cubic structure. If the radius of metal ion is $$0.92 \mathring (A)$$ the edge length of the unit cell of the crystal is

A
$$0.8464 \mathring {A}$$

B
$$1.252 \mathring {A}$$

C
$$5.187 \mathring {A}$$

D
$$2.6 \mathring {A}$$
Question 9
1 / -0

Which of the following is correct?

A
Crystal system $$ \rightarrow $$ Cubic;
Axial distance $$ \rightarrow $$ a=b=c;
Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
Examples $$ \rightarrow $$ $$Cu,KCl$$

B
Crystal system $$ \rightarrow $$ Monoclinic$$ \rightarrow $$ ; Axial distance $$ \rightarrow $$ a=b=c ;
Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
Examples $$ \rightarrow $$ $$ PbCrO_2, PbCrO_4 $$

C
Crystal system $$ \rightarrow $$ Rhomboherdal; Axial distance $$ \rightarrow $$ a = b = c;
Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
Example $$ \rightarrow $$ $$ CaCO_3 $$

D
Crystal system $$ \rightarrow $$ Triclinic; Axial distance $$ \rightarrow $$ a = b = c;
Axial angles $$ \rightarrow $$$$ \alpha = $$ $$\beta = y = 90^o $$ ;
Examples $$ \rightarrow $$ $$ K_2Cr_2O_7, CuSO_4.5H_2O $$
Question 10
1 / -0

The formula of $$ZnO$$ crystal after heating is ________.

A
$$Zn_{1-x}O$$

B
$$Zn_{1+x}O$$

C
$$ZnO$$

D
All of the above

Solution