ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Why is granulated zinc preferred in the laboratory preparation of hydrogen?

Give a test to identify hydrogen ?

Give a test to identify hydrogen ?

What are thermal decomposition reactions ? Explain with an example.

What do you mean by redox reaction ? Explain with the help of an example.

State the poisonous nature of carbon monoxide?

How would you show that hydrogen is lighter than air?

How would you show that hydrogen is lighter than air?

Starting from zinc how would you obtain hydrogen using Steam.
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

Starting from zinc how would you obtain hydrogen using Steam.
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

Starting from zinc how would you obtain hydrogen using a dilute acid. 
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

Starting from zinc how would you obtain hydrogen using a dilute acid. 
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

Starting from zinc how would you obtain hydrogen using an alkali. 
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

Starting from zinc how would you obtain hydrogen using an alkali. 
[Give balanced equation & name the product formed in the case other than hydrogen].
Name a metal which will not react with the reactants above to give hydrogen.

In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for the addition of traces of copper [II] sulphate to the reaction medium.

In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for the addition of traces of copper [II] sulphate to the reaction medium.

In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for the collecting the hydrogen by downward displacement of water and not air & collecting it after all the air in the apparatus is allowed to escape.

In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for the collecting the hydrogen by downward displacement of water and not air & collecting it after all the air in the apparatus is allowed to escape.

Draw neat labelled diagrams for two different experiments to prove that – hydrogen is lighter than air.

Draw neat labelled diagrams for two different experiments to prove that – hydrogen is lighter than air.