Solid State Test

Result

Solid State Test - 52

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Hexagonal close packing is found in crystal lattice of:

A
$${\text{Na}}$$

B
$${\text{Mg}}$$

C
$${\text{Al}}$$

D
None of these

Solution

Co-ordination number in $$HCP = 12$$

Co-ordination number in $$Mg$$ $$= 12$$.
Question 2
1 / -0

How many lithium atoms are present in a unit cell with edge length $$3.5\mathring { A } $$ and density $$\quad 0.53gcm^{ -3 }$$ ? (Atomic mass of Li =6.94)

A
2

B
1

C
4

D
6

Solution

The number of Li atoms in a unit cell is 2.

The density of the atom is given by the expression

density=(Zm/N(a^3))

Here, Z is the number of atom in a unit cell, m is the molecular mass of the atom, N is the Avogadro's number, and a is edge length

Plugging the values in the above equation

0.53=

z=2

Therefore the number of atom in a unit cell of Li is 2.
Question 3
1 / -0

Packing efficiency of hcp structure is _________.

A
$$68\%$$

B
$$52.4\%$$

C
$$74\%$$

D
$$82\%$$

Solution

Both ccp and hcp are highly efficient lattice; in terms of packing. The packing efficiency of both types of close packed structure is 74%, i.e. 74% of the space in hcp and ccp is filled. The hcp and ccp structure are equally efficient; in terms of packing.
The packing efficiency of simple cubic lattice is 52.4%. And the packing efficiency of body centered cubic lattice (bcc) is 68%.
Question 4
1 / -0

The number of carbon atoms in the unit cell of diamond is ___

A
6

B
1

C
4

D
8

Solution

8
Total no. of atoms present in a diamond cubic unit cell is 1 + 3 + 4 = 8. Since each carbon atom is surrounded by four more carbon atoms,the co-ordination number is 4.
Question 5
1 / -0

The atom that present in the centre of BCC unit cell share with how many unit cells?

A
1 unit cell

B
4 unit cells

C
3 unit cells

D
2 unit cells

Solution

The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atomsper unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. The simple cubic has a coordination number of 6 and contains 1 atom per unit cell

Question 6

1 / -0

In NaCI unit cell if all the ions lying along the axis as shown in the figure are removed. the number of $${ Na }^{ + }$$ and $${ CI }^{ - }$$ remaining in the unit cell are.

4 and 4

3 and 3

1 and 1

4 and 3

Solution

NaCl is a kind of FCC
unit cell

*Anions are involved
in closepacking. So Cl^-ions will be present at all the corners as well as at
centre of each face
     
 Contribution of one anion at corner= 1/8
  
  Total contribution = 1/8 × no. of corners = 1/8 × 8= 1

 Contribution of one anion at face centre = ½
   Total contribution = 1/2×no. Of faces = 1/2×6= 3
So, total number of
anions =1+3 = 4

* Cations move to the
voids . So Na+ ions will be present in the octahedral voids ( they don't move
to tetrahedral voids as they are larger in size than the tetrahedral voids).
     
 No. Of octahedral voids = no. Of constituent particles = 4
So, we have total 4 Na
+ ions in a unit cell
= 4 Na+ ions and
4 Cl- ions.

Question 7
1 / -0

The co-ordination number of hexagonal close packing:

A
4

B
6

C
8

D
12
Question 8
1 / -0

The number of spheres contained (i) in one body centred cubic unit cell and (ii) in one face centred cubic unit cell, is:

A
In (i) $$2$$ and in (ii) $$4$$

B
In (i) $$3$$ and in (ii) $$2$$

C
In (i) $$4$$ and in (ii) $$2$$

D
In (i) $$2$$ and in (ii) $$3$$

Solution

The number of spheres in one body centred cubic and in one face centred cubic unit cell is $$2$$ and $$4$$ respectively.

A IS CORRECT OPTION
Question 9
1 / -0

The three dimensional graph of lattice points which sets the pattern for the whole lattice is called:

A
Space lattice

B
simple lattice

C
Unit cell

D
Crystal lattice

Solution

The three dimensional graph of lattice points which sets the pattern for the whole lattice is called unit cell

Hence C is correct option
Question 10
1 / -0

Which of the following is not a characteristic of a crystalline solid?

A
Definite and characteristic heat of fusion

B
Isotropic nature

C
A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal

D
A true solid

Solution

$$Anisotropy:$$ Crystalline solids are anisotropic in nature, that is some of their physical properties like electrical resistance or refractive index show different values when measured along different directions in the same crystal. This arises from different arrangement of particles in different directions arrangement of particles along different directions.

$$Isotropy:$$ It is a characteristic of amorphous solid. Physical properties like electrical resistance or refractive index show same values when measured along different directions.
Option B is correct.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Solid State Test - 52

Result

Solid State Test - 52

Score

-

Rank

-

SHARING IS CARING

Question 1

$${\text{Na}}$$

$${\text{Mg}}$$

$${\text{Al}}$$

None of these

Solution

Question 2

2

1

4

6

Solution

Question 3

$$68\%$$

$$52.4\%$$

$$74\%$$

$$82\%$$

Solution

Question 4

6

1

4

8

Solution

Question 5

1 unit cell

4 unit cells

3 unit cells

2 unit cells

Solution

Question 6

4 and 4

3 and 3

1 and 1

4 and 3

Solution

Question 7

4

6

8

12

Question 8

In (i) $$2$$ and in (ii) $$4$$

In (i) $$3$$ and in (ii) $$2$$

In (i) $$4$$ and in (ii) $$2$$

In (i) $$2$$ and in (ii) $$3$$

Solution

Question 9

Space lattice

simple lattice

Unit cell

Crystal lattice

Solution

Question 10

Definite and characteristic heat of fusion

Isotropic nature

A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal

A true solid

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.