Solid State Test

Result

Solid State Test - 1

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following statements is not correct about molecular crystals?

A
They are generally soft and easily compressible

B
They are good conductors of electricity as the electrons are delocalised in the bonds

C
They have low melting and boiling points

D
They consist of polar or non-polar molecules

Solution

Molecular crystals are bad conductors of electricity as the electrons are localised in the bonds.
Question 2
4 / -1

Ionic solids conduct electricity In molten state but not in solid state because

A
In molten state free ions are furnished which are not free to move in solid state

B
In solid state ionic solids are hard, brittle and become soft in molten state

C
All solids conduct electricity in molten state

D
In solid state ions are converted to atoms
are insulators

Solution

Ionic solids conduct electricity in molten state since in molten state ionic solids dissociate to give free ions which in solid state are not free to move and are held together by strong electrostatic forces of attraction.
Question 3
4 / -1

Which of the solids show the following properties?
(i) Electrical conductivity
(ii) Malleability
(iii) Ductility
(iv) Fairly high melting point

A
lonic solids

B
Covalent solids

C
Metallic solids

D
Molecular solids

Solution

Metallic solids conduct electricity in molten state as well as solid state and are malleable, ductile and have fairly high melting point.
Question 4
4 / -1

The major binding force of diamond, silicon and quartz is

A
Electrostatic force

B
Electrical attraction

C
Covalent bond force

D
van der Waals Forces

Solution

In covalent solids, the forces of attraction are covalent bond forces.
Question 5
4 / -1

Solid X is a very hard solid which is electrical insulator in solid as well as in molten state and has extremely high melting point. What type of solid is it?

A
Ionic solid

B
Covalent solid

C
Metallic solid

D
Molecular solid

Solution

Covalent solids or network solids are very hard with high melting point and are insulators in solid as well 25 in molten state.