ICSE ICSE Class 8 - CISCE Question Bank Solutions

 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

What do you observe when Iron nail is kept in copper sulphate solution for sometime.

 Multiple Choice Question

Hydrogen is

Give reason .

A person suffering from acidity is advised to take an antacid.

Give reason.

Acidic soil is treated with quick lime.

Give a reason.

Wasp sting is treated with vinegar.

What are oxides ? 

Give reason for Silica gel pouches are kept in unused water bottle.

Give reason On opening a bottle of a cold drink, a fizz sound is heard.