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

Is PbO₂ a base or not? Comment.

Write the balanced equation for the preparation of the following salt in the laboratory:

A soluble sulphate by the action of an acid on an insoluble base.

Write the balanced equation for the preparation of the following salt in the laboratory:

An insoluble salt by the action of an acid on another salt.

Write the balanced equation for the preparation of the following salt in the laboratory:

An insoluble base by the action of a soluble base on a soluble salt.

Write the balanced equation for the preparation of the following salt in the laboratory:

A soluble sulphate by the action of an acid on a metal.

Name two colourless gases, which when mixed, produce a white solid.

Solution A reacts with an acid B (which gives greenish yellow gas on reacting with oxidizing agents like Pb₃O₄) to give white precipitate C insoluble in nitric acid but soluble in ammonium hydroxide. Name A, B and C.

How is the following metallic oxide reduced? Write equations:

Iron (ll) oxide

How is the following metallic oxide reduced? Write the equation:

Zinc oxide

Explain with reason: 

In the electrolytic reduction of alumina, the graphite anode is gradually consumed.

Draw electron - dot structure and structural formula of methane.

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.