(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

When sodium chloride is heated with concentrated sulphuric acid below 200°C, one of the products formed is ______.

Write a balanced chemical equation for each of the following reactions :
(i) Reduction of copper (II) oxide by hydrogen

Calculate the number of moles in 12g of oxygen gas.

Give the appropriate term defined by the statement given below:

The covalent bond in which the electrons are shared equally between the combining atoms.

Taking hydrogen chloride and methane as examples, distinguish between a polar covalent bond and a non polar covalent bond.

Explain the following briefly:
Sodium chloride dissolves in water but carbon tetra chloride is insoluble in water.

Explain the following briefly.
Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.

Explain the following briefly:
Cl₂ is a non polar molecule, while HCl is a polar molecule.

Give examples for the following:
Two solid covalent compounds.

Give examples for the following:
Two liquid non polar compounds.

Give examples for the following:
Two gaseous polar compounds.

Give examples for the following:
Two gaseous non polar compounds.

What do you understand by lone pair?

Explain the structure of Hydronium ion.

Explain the structure of Ammonium ion.

Explain the following:
Covalent compounds are generally gases or liquids or soft solids.

Explain the following:
Covalent compounds have low melting and boiling point.

Explain the following:
Non-polar covalent compounds are insoluble in water.

Explain the following:
Polar covalent compounds are good conductors of electricity.