English Medium कक्षा १० - CBSE Question Bank Solutions

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?

The solution of one of the following compounds will not conduct electricity. This compound is:

Buckminsterfullerene is an allotropic form of the element:

Out of KCl, HCl, CCl₄ and NaCl, the compounds which are not ionic are:

The number of covalent bonds in pentane (molecular formula C₅H₁₂) is ______.

One of the following compounds is not ionic in nature. This compound is:

A covalent molecule having a double bond between its atoms is ______.

The molecules having triple bond in them are ______.

One of the following contains a double bond as well as single bonds. This is:

Which of the following has a triple bond as well as single bonds?

The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was ______.

One of the following is not an allotrope of carbon. This is:

Two non-metals combine with each other by the sharing of electrons to form a compound X.

1. What type of chemical bond is present in X?
2. State whether X will have a high melting point or low melting point.
3. Will it be a good conductor of electricity or not?
4. Will it dissolve in an organic solvent or not?

A saturated hydrocarbon has fifty hydrogen atoms in its moleucle. The number of carbon atoms in its molecule will be ______.

A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be ______.

The electronic configurations of three elements X, Y and Z are as follows:

1. Which two elements will combine to form an ionic compound?
2. Which two elements will react to form a covalent compound?

Give reasons for your choice.