ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

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?

 Give reason for the following:

Helium replaced hydrogen in weather observation balloons?

Give a balanced chemical equation for the reaction.

Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]

 Hydrogen is a good reducing agent: What do you understand by the above statement? Explain with the help of copper oxide as an example.

Define precipitation reaction.

Write the missing reactants and products and balance the equations.

NaOH + ............... `→` NaCI + ...................

Write the missing reactants and products and balance the equations.

\[\ce{KClO3 ->[heat]}\] ___________+ ____________

Write the missing reactants and products and balance the equations.

................+ HCI `→` NaCI + `"H"_2"O"` + .........................

State four uses of hydrogen: 

Define catalytic hydrogenation.

 Multiple Choice Question

 Equal volumes of hydrogen and chlorine are exposed to diffused sunlight to prepare

Multiple Choice Question

Hydrogen is responsible for producing