Chemistry Test

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Chemistry Test - 24

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Weekly Quiz Competition

Question 1
5 / -1

Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure?

A
Unit cell

B
Lattice

C
Crystal

D
Bravais Index

Solution

Unit cell is the smallest entity of a crystal lattice which, when repeated in space (3 dimensions) generates the entire crystal lattice. Lattice comprises of the unit cells which hold all the particles in a particular arrangement in 3 dimensions. Crystal is a piece of homogenous solid and Bravais indices are used to define planes in crystal lattices in the hexagonal system.
Question 2
5 / -1

In primitive unit cubic cell, only _______ of an atom (or ion or molecule) belongs to a particular unit cell.

A
1/4th

B
1/3rd

C
1/8th

D
1/2nd

Solution

Explanation: In primitive unit cubic cell, each atom at the corner is shared between 8 adjacent unit cells. Thus, only 1/8th of an atom (or ion or molecule) belongs to a particular unit cell.
Question 3
5 / -1

What kind of order is present in a solid for it to be a perfectly crystalline solid?

A
Long range order

B
Short range order

C
No order

D
Both, short range and long range order

Solution

Only short range order is a feature of amorphous solids. Crystalline solids exhibit both short and long range order. Crystalline solids are formed by repetitive arrangement of unit cells.
Question 4
5 / -1

Which of the following statements regarding Ideal solutions is false?

A
Ideal solutions obey Raoult’s law under all conditions of temperature and concentrations

B
There will be some change in volume on mixing the components, i.e., ΔV_mixing ≠ 0

C
There will be no change in enthalpy when the two components are mixed, i.e., ΔH_mixing = 0

D
There will be no change in volume on mixing the components, i.e., ΔV_mixing = 0

Solution

An ideal solution is the solution in which each component obeys Raoult’s law under all conditions of temperature and concentrations. An ideal solution will satisfy the following conditions:

I. There will be no change in volume on mixing the components, i.e., ΔV_mixing = 0.

II. There will be no change in enthalpy (i.e., no heat is evolved or absorbed) when the two components are mixed, i.e., ΔH_mixing = 0.
Question 5
5 / -1

Which of the following unit cells has constituent particles occupying the corner positions only?

A
Body-centered cell

B
Primitive cell

C
Face centered cell

D
End-centered cell

Solution

According to classification of unit cells, a primitive unit cell is one which has all constituent particles located at its corners. BCC has one particle present at the center including the corners. FCC has an individual cell shared between the faces of adjacent cells. End centered cells have cells present at centers of two opposite faces.
Question 6
5 / -1

The total number of atoms in one unit cell of primitive unit cubic cell is ______ atom(s).

A
1

B
8

C
4

D
2

Solution

In primitive cubic unit cell, atoms are present only at the corner of the cell. Thus, in actual, only 1/8th of an atom (or ion or molecule) belongs to a particular unit cell. Hence, the total number of atoms in primitive cubic unit cell.
Question 7
5 / -1

Which of the following can be used to describe a crystalline solid?

A
Homogeneous, anisotropic

B
Heterogeneous, anisotropic

C
Heterogeneous, isotropic

D
Homogeneous, isotropic

Solution

Homogeneity refers to uniformity in composition, which is a characteristic property of crystalline solids. Isotropy is when the values of physical properties do not change with direction throughout the body of the solid. Crystalline solids are anisotropic because the composition of the solid changes with direction, hence the physical properties also change with direction.
Question 8
5 / -1

Which of the following is not an example of an Ideal solution?

A
Benzene + Toluene

B
n-Hexane + n-Heptane

C
Ethyl alcohol + Water

D
Ethyl bromide + Ethyl chloride

Solution

An ideal solution may be defined as the solution in which no volume change and no enthalpy change take place on mixing the solute and the solvent in any proportion. Ethyl alcohol + Water is a Non-Ideal solution.
Question 9
5 / -1

What is the coordination number of a body-centered unit cell?

A
6

B
12

C
8

D
4

Solution

Coordination number of a unit cell is defined as the number of atoms/ions that surround the central atom/ion. In the case of BCC, the central particle is surrounded by 8 particles hence, 8.
Question 10
5 / -1

The total number of atoms in one unit cell of body-centered unit cubic cell is ______ atoms.

A
4

B
3

C
8

D
2
Solution
In body-centered cubic unit cell, one atom is present at each of the corners and one atom at its body center.
- 1 body-centered atom
Thus, the total number of atoms in body-centered cubic unit cell: 1+1=2 atoms.

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Chemistry Test - 24

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Chemistry Test - 24

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Question 1

Unit cell

Lattice

Crystal

Bravais Index

Solution

Question 2

1/4th

1/3rd

1/8th

1/2nd

Solution

Question 3

Long range order

Short range order

No order

Both, short range and long range order

Solution

Question 4

Ideal solutions obey Raoult’s law under all conditions of temperature and concentrations

There will be some change in volume on mixing the components, i.e., ΔVmixing ≠ 0

There will be no change in enthalpy when the two components are mixed, i.e., ΔHmixing = 0

There will be no change in volume on mixing the components, i.e., ΔVmixing = 0

Solution

Question 5

Body-centered cell

Primitive cell

Face centered cell

End-centered cell

Solution

Question 6

1

8

4

2

Solution

Question 7

Homogeneous, anisotropic

Heterogeneous, anisotropic

Heterogeneous, isotropic

Homogeneous, isotropic

Solution

Question 8

Benzene + Toluene

n-Hexane + n-Heptane

Ethyl alcohol + Water

Ethyl bromide + Ethyl chloride

Solution

Question 9

6

12

8

4

Solution

Question 10

4

3

8

2

Solution

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There will be some change in volume on mixing the components, i.e., ΔV_mixing ≠ 0

There will be no change in enthalpy when the two components are mixed, i.e., ΔH_mixing = 0

There will be no change in volume on mixing the components, i.e., ΔV_mixing = 0