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प्रश्न
Give reason for the following:
Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does.
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उत्तर
Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid.
Zn lies above [H] in reactivity series of metals and being more reactive can displace hydrogen from dil. acids.
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संबंधित प्रश्न
Give reason for the following:
Nitric acid not used for the preparation of hydrogen gas?
Draw a neat and well-labelled diagram for the laboratory preparation of hydrogen.
FILL IN THE BLANK
Sodium liberates hydrogen when treated with cold .............
TRUE \ FALSE
Lead reacts briskly with dilute hydrochloric acid to form hydrogen.
Name the impurities present in hydrogen prepared in the laboratory.
Under what conditions can hydrogen be made to combine with chlorine?
Name the products and write the equation for the reaction.
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 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 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 and dil. acid. Give a reason for the following:
Hydrogen is not collected over air.
Give a reason for the following.
Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.
Name the following.
A gaseous reducing agent which is basic in nature.
Select the correct answer from the symbol in the bracket.
The element which forms a diatomic molecule.
The diagram represent the preparation and collection of hydrogen by a standard
laboratory method.
State what is added through the thistle funnel ‘Y’
The diagram represent the preparation and collection of hydrogen by a standard laboratory method.
State, why hydrogen is collected after all the air in the apparatus, is allowed to escape.
