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

Name the gas obtained when ammonia burns in an atmosphere of oxygen without any catalyst.

Complete the following equation.
4 NH₃ +5O2 →
What important process starts with the reaction in above? Name the catalyst used.

A gas ‘A’ reacts with another gas ‘B’ in the presence of a catalyst to give a colourless gas ‘C’. The gas ‘C’ when comes in contact with air produces a brown gas ‘D’. The solution of ‘A’ in water turns red litmus blue. Explain the observations.

Ammonia gas is passed over heated copper (I) oxide. 

Identify the substance underlined:

The catalyst used to oxidise ammonia. 

Identify the substance underlined:

The organic compound which when solidified, forms an ice like mass.

 Name the gas evolved in each of the following cases : 
Alumina undergoes electrolytic reduction.

 Name the gas evolved in each of the following cases :
Ethene undergoes hydrogenation reaction. 

Name the gas evolved in each of the following cases :
Ammonia reacts with heated copper oxide.

Study the flow chart given and give balanced equations to represent the reactions A, B and C:

\[\ce{Mg3N2 ->[A] NH3 <=>[B][C] NH4Cl}\]

 Copy and complete the following table which refers to the industrial method for the preparation of ammonia and sulphuric acid: 

How will you prepare hydrochloric acid in laboratory?

Explain, why (or give reasons for)
Hydrochloric acid cannot be concentrated above 22.2% by boiling.

Explain, why (or give reasons for)
Only a very dilute solution of hydrogen chloride in water can be concentrated by boiling the solution while a very concentrated solution would become less concentrated when boiled.

Explain, why (or give reasons for)
A solution of HCl gas in water turns blue litmus red and conducts electricity, while HCI gas dissolves in toluene and it has no effect on litmus and does not conduct electricity.

Explain, why (or give reasons for)
An aqeous solution of chlorine is acidic is nature.

What would happen if :
Concentrated hydrochloric acid is kept open.

What would happen if
Hydrogen chloride prepared in laboratory, is passed through water, using a delivery tube.

Write three equations to show that hydrochloric acid acts as an acid.

Describe an experiment to prove the following:
HCI is highly soluble in water.