English Medium इयत्ता १० - CBSE Question Bank Solutions

Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of oxygen, O₂, is formed from two oxygen atoms. What name is given to this type of bonding? (At. No. of oxygen = 8)

Draw the electron-dot structure of NH₃ and state the type of bonding. 

Draw the electron-dot structure of N₂ and state the type of bonding. 

Write two points of difference in the structures of diamond and graphite.

Explain why, graphite can be used as a lubricant but diamond cannot.

Explain why, diamond can be used in rock drilling equipment but graphite cannot.

State one use of diamond which depends on its 'extraordinary brilliance' and one use of graphite which depends on its being 'black and quite soft'.

What is diamond? Of what substance is diamond made?

Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond.

Explain why, diamond has a high melting point.

State any two uses of diamond.

 What is graphite?

what substance is graphite made?

Describe the structure of graphite with the help of a labelled diagram.

Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?

State any two uses of graphite.

Why are covalent compounds generally poor conductors of electricity?

The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S

The solution of one of the following compounds will not conduct electricity. This compounds is:
(a) NaCl
(b) CCl₄
(c) MgCl₂
(d) CaCl₂