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प्रश्न
A metal ______ hydrogen in the reactivity series gives hydrogen with ______.
उत्तर
A metal above hydrogen in the reactivity series gives hydrogen with dilute acids.
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संबंधित प्रश्न
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
For laboratory preparation of hydrogen, give the following:
materials used
For laboratory preparation of hydrogen, give the following:
method of collection
For laboratory preparation of hydrogen, give the following:
chemical equation
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
Select the correct options for the following statement:
The metallic compound formed when a metal above aluminium in the activity series reacts with steam.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Fe3O4 + H2}\]
Give a balanced equation for the following conversion.
\[\ce{CO + H2<-H2O->CO2 + H}\]
