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12th Chemistry Monthly Test - 1 ( Solid State )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 1 ( Solid State )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The size of the anion in Frenkel defect crystal is_______.

larger than the cation
smaller than the cation
equal in size with cation
both are larger in size

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

8
4
2
6

Graphite and diamond are

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

An example of metal deficiency defect
NaCl

AgCl

CsCl

FeS
The number of carbon atoms per unit cell of diamond is
8

6

1

4

An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

AB
AB₃
A₃B
A₈B₆

The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length oif the edge of the unit cell is

488.5pm
848.5pm
884.5pm
484.5pm

The coordination number of a metal crystallising in a hexagonal close packed structure is __________

6
4
8
12

An excess of potassium ion makes KCl crystals appear violet since

Some of anionic sites are occupied by unpaired electron
Anionic sites are occupied by pair of electrons
both (a) and (b)
neither (a) nor (b)

ABAB type of packing is called _________.

hexagonal close packing
cubic close packing
tetragonal close packing
none of the above

Graphite is a good conductor of electricity due to the presence of____________

Lone pair of electrons
Free valence electrons
Cations
Anions

The seven primitive crystal systems differ in the _________ arrangement.

crystallographic axes
angles
both (a) and (b)
neighter (a) or (b )

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

1
2
3
4

Coordination number of tetrahedral and octahedral voids respectively are________.

2,4
4,2
4,6
6,4

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

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

The number of carbon atoms per unit cell of diamond unit cell is_________

8
6
1
4

Part - B

Generic 2 - Answer All Question

Explain briefly seven types of unit cell

What is point defect in crystals?

What is the total number of atoms per unit cell in a face - centered cubic structure (fcc)?

The energy required to vapourize one mole of copper is smaller than that of energy required to vapourise 1 mole of diamond why?

Write a note on the assignment of atoms per unit cell in body centred cubic lattice or CsCl.

What is coordination number?

Sodium crystallizes in a bee unit cell. Calculate the approximate number of unit cells in 9.2g of sodium. (Atomic mass Na 23u).

Which point effect in crystal doesn't alter the density of the relevant solid?
What type of stoichiometric defect is shown by ZnS.

Define the term amorphous.

Name an element with which silicon can be doped to give an n-type semi conductor.
Differentiate crystalline solids and amorphous solids.

Why do solids have a definite volume?

Give any three characteristics of ionic crystals.

What is F centre?

Ionic solids conduct electricity in molten state but not in solid state. Explain.

Name the seven primitive crystal systems.

Part - C

Generic 3 - Answer All Question

What is the formula of a compound in which the element Y forms ccp lattice and atoms of X occupy 2/3rd of tetrahedral voids?

Inspite of long range order in the arrangement of particles, why are the crystals usually not perfect?
Experiment shows that Nickel oxide has the formula Ni_0.96.O_1.00 What fraction of Nickel exists as of Ni²⁺ and Ni³+ ions?

Explain Schottky defect.

ZnO turns yellow on heating. Why?

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

Silver crystallines in fcc lattice. If edge length of the cell is 4.07 x 10^-8 em and density is 10.5 g cm^-3. Calculate the atomic mass of silver

If NaCI is doped with 10^-3 mol % of SrCl₂ What is the concentration of cation valencies?

Diffraction angle 2θ equal to 14.8^o for a crystal having interplanar distance in the crystal is 0.400 nm when second order diffraction was observed. Calculate the wavelength of X-ray used.

State Bragg's law.

Calculate the number of unit cells in' 8.1 g of aluminium, if it crystallises in a face centered cubic structure. (Atomic mass of AI = 27 g mol^-1).
Why ionic crystals are hard and brittle?

Part - D

Generic 5 - Answer All Question

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.

Explain the following:
Similarities and differences between metallic and ionic crystals.

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.
KF crystallizes in fcc structure like sodium chloride. calculate the distance between K+ and F⁻ in KF.( given : density of KF is 2483. gcm^-3)

How are crystals classified?

An element has bcc structure with a cell edge of 288 pm. the density of the element is 7.2 gcm^-3. how many atoms are present in 208g of the element.

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