(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Give reason for the following:

Silver nitrate solution is kept in coloured bottles.

Give reason for the following:

Molybdenum is used in the manufacture of ammonia.

Give reason for the following:

Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.

Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.

When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.

Explain,giving one example of the following chemical changes:

Reversible reaction

What do you understand by precipitation reaction? Explain with examples.

State the type of reactions for the following represent and balance the ones that are not balanced.

Cl₂ + 2KBr → 2KCl + Br₂ 

State the type of reactions for the following represent and balance the ones that are not balanced.

NaOH + HCl → NaCl + H₂O

Multiple choice:

Which of the following is not a characteristic of a chemical change?

Multiple choice:

A reaction of a type: AB + CD → AD + CD, involves

Multiple choice:

Thermal decomposition of sodium carbonate will produce

What is a chemical change? Give two examples of chemical change?

What do you observe? When

Barium chloride is added to sodium sulphate solution

What do you observe? When

Water is added to the quick lime.

What do you observe? When

Sodium chloride solution is added to silver nitrate solution.

Give an example of the following chemical changes.

A reaction involving

     (i) Change of state

     (ii) formation of precipitate

Give an example of the following chemical changes.

A reaction where colour change is noticed.

State the main characteristics of chemical reactions. Give at least one example in each case.