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12th Chemistry weekly Test - 3 ( Solid State )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 3 ( Solid State )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Potassium has a bcc structure with nearest neighbor distance 4.52 A0 . its atomic weight is 39. its density will be

915 kg m^-3
2142 kg m^-3
452 kg m^-3
390 kg m^-3

In edge centred lattice, an atom in the edge is shared by__________

4 unit cell
12 unit cell
2 unit cell
8 unit cell

Assertion : monoclinic sulphur is an example of monoclinic crystal system
Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)

Both assertion and reason are true and reason is the correct explanation of assertion
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Both assertion and reason are false.

The number of chloride ions present per unit of CsCI are

6
8
1
4

In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F- Ion are (NEET)

4 and 2
6 and 6
8 and 4
4 and 8

The correct order of packing efficiency in different types of unit cells is________.

fcc> bcc >sc
sc < fcc < bcc
fcc < bcc> sc
bcc < fcc < sc

The fraction of total volume occupied by the atoms in a simple cubic is

\(\left( \cfrac { \pi }{ 4\sqrt { 2 } } \right) \)
\(\left( \cfrac { \pi }{ 6 } \right) \)
\(\left( \cfrac { \pi }{ 4 } \right) \)
\(\left( \cfrac { \pi }{ 3\sqrt { 2 } } \right) \)

Which of the following exists as covalent crystals in solid state?

phosphorus
sulphur
chlorine
silicon

Pick out the example for covalent and molecular crystal.

Ice,Diamond
Diamond,Ice
NaCl, FeS
FeS,Ice

The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)

6.023 X 10²³
6.023 X 10²²
60.23 X 10²³
\(\left( \cfrac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)

The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as

Schottky defect
F center
Frenkel defect
non-stoichiometric defect

Graphite and diamond are

Covalent and molecular crystals
ionic and covalent crystals
both covalent crystals
both molecular crystals

A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

\(\left( \cfrac { 100 }{ 0.414 } \right) \)
\(\left( \cfrac { 0.732 }{ 100 } \right) \)
100X0.414
\(\left( \cfrac { 0.414 }{ 100 } \right) \)

The coordination number of ZnS is _________.

3
4
6
8

A regular three dimensional arrangement of identical points in space is called

Unit cell
Space lattice
Primitive
Crystallography

Which of the following features is false regarding the structure of CsCI?

It has bee arrangements
Co-ordination number for each ion is 8
Number of atoms in a unit cell is 4
The radius ratio (r₊/r_-) is 0.93

Frankel defect is also known as __________.

stoichiometric defect
dislocation defect
both (a) & (b)
non-stoichiometric defect

The number of octahedral void(s) per atom present in a cubic close-packed structure is_________.

1
2
3
4

In which of the following arrangements, octahedral voids are formed?

fcc
bcc
simple cubic
hcp

Potassium crystallizes in a bee lattice, hence the coordination number of potassium in potassium metal is__________.

0
8
6
4

Part - B

Generic 2 - Answer All Question

Name an element with which silicon can be doped to give an n-type semi conductor.

Name the seven primitive crystal systems.

Define unit cell

In CaF₂ crystal, Ca²⁺ ions are present in arrangement. Calculate the number of F- ions in the unit cell.

What are point defects?

Explain briefly seven types of unit cell

Why is FeS not formed in stoichiometric composition?

Distinguish between.
Face - centred and body - centred unit cells.

NaCI has a sharp melting point but glass does not - Justify.

classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

Part - C

Generic 3 - Answer All Question

Explain Schottky defect.

A metallic element exists as a cubic lattice. Each edge of the unit cell is 2.88\(\mathring { A } \). The density of the metal is 7.20 g cm^-3. How many unit cells there will be in 100g of the metal?

Why ionic crystals are hard and brittle?

Write the properties of ionic crystals.

What is the two dimensional coordination number of a molecule in square close packed layer?

Calculate the percentage efficiency of packing in case of body centered cubic crystal.

Why are solids rigid?

ZnO turns yellow on heating. Why?

Classify the following solids in different categories based on the nature of intermolecular force operating in them: Potassium sulphate, tin, benzene, urea, ammonia, water, zinc sulphide, graphite, rubidium, argon, silicon carbide.

Distinguish the following.
Crystal lattice and unit cell.

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