ICSE ICSE Class 8 - CISCE Question Bank Solutions

Complete and balance the following chemical equations:

Fe `"SO"_4`  + NaOH  `→`

   (aq.)          (aq.)

Explain the following reaction with one suitable example .
Combination reactions

Explain the following reaction with one suitable example .
Displacement reaction

Explain the following reaction with one suitable example .
Double decomposition reaction.

Name the type of chemical reaction shown by the following equation:

`CaCO_3 → CaO + CO_2`

Complete and balance the following chemical equation:

\[\ce{Pb(NO3)2 ->[Heat]}\]

Complete and balance the following chemical equations:

Ba`"CI"_2`   +  `"H"_2"SO"_4`   `→`

    (aq.)           (aq.)

Fill in the blanK

 A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................

Indicate which of the following statement is true and which is false:

The hydrogen molecule is monovalent.

Write your observations and name the product when

An aqueous solution of barium chloride is added to dilute sulphuric acid.

Hydrogen is combustible as well as a supporter of combustion.

Indicate which of the following statement is true and which is false:

Hydrogen gas is easily liquefiable. 

Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.

Name the four main sources of water.

 State the importance of water cycle in nature.

Why is water very precious for all living being ?

Complete and balance the following equation:

H₂+____________→ 2HCI

Name the two gases from which water is formed. What is the chemical composition of these two gases in water ?  

Give reason for the following:

A pop sound produced when hydrogen is burnt?