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प्रश्न
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
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उत्तर
Ca + 2H2O → Ca(OH)2 + H2
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
Complete the following word equation:
Sodium hydroxide + zinc → hydrogen + _________
For laboratory preparation of hydrogen, give the following:
method of collection
For laboratory preparation of hydrogen, give the following:
chemical equation
Complete and balance the following reaction.
Na + H2O →_____________ +___________
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Zinc - Zn + 2HCl → ______ + _______ [g]
Account for the following fact:
Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid.
Account for the following fact:
Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
Give a balanced equation for the following conversion.
\[\ce{ZnO<-H2O->Fe3O4}\]
