ICSE ICSE Class 8 - CISCE Question Bank Solutions

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.

Give balanced equation for the following conversion:

Zinc to sodium zincate – using an alkali.

Give balanced equation for the following conversion:

Zinc to sodium zincate – using an alkali.

Give balanced equation for the following conversion:

Acidified water to hydrogen – by electrolysis.

Give balanced equation for the following conversion:

Acidified water to hydrogen – by electrolysis.

Give reason for the following:

Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does.

Give reason for the following:

Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does.

Give reason for the following:

In the laboratory preparation of hydrogen from zinc and dilute hydrochloric acid – the zinc used granulated zinc.

Give reason for the following:

In the laboratory preparation of hydrogen from zinc and dilute hydrochloric acid – the zinc used granulated zinc.