Solids

Question 1

What is coordination no… ?

Answer 1

In a ionic solid, the no. of ions of the opp. charge in the immediate surroundings of a certain ion is called coordination no.

Question 2

In ionic crystals which ions have a surrounded by a higher no. of ions

Answer 2

Usually cations

Question 3

What does a higher radius ratio entail?

Answer 3

• Larger cation

* Higher coordination no.

Question 4

What are covalent solids also called?

Answer 4

They are also called network solids

Question 5

what is the state if hybridisation of diamond?

Answer 5

sp3

Question 6

What is the bond length and angle of diamond?

Answer 6

Bond length: 1.54 Angstrom

Bond angle: 109.28’

Question 7

Why does diamond have such a high melting point?

Answer 7

Diamond has very strong covalent bonds.

Question 8

Why is diamond a very bad conductor of electricity?

Answer 8

This is because, all the free electrons participate in the formation of C-C pi bonds.

Question 9

Diamond is usually inert with the exception of …..?

Answer 9

• Na2CO3

* K2Cr2O7 and conc. H2SO4 which reacts with diamonds to give CO2

Question 10

What are the characteristics of solids that have the schottky defect?

Answer 10

• The constituent atoms have to have comparable atomic radii

* High coordination no.

Question 11

Just a note:

Answer 11

10^16 ions per defect