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प्रश्न
Why are the following metals not used in the lab. preparation of hydrogen?
aluminium
उत्तर
Aluminium forms a protective coating of Al2O3 due to its great affinity for oxygen. So, it does not give hydrogen with acid after the reaction has occurred for some time.
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संबंधित प्रश्न
A metal ______ hydrogen in the reactivity series gives hydrogen with ______.
Why nitric acid is not used in the preparation of hydrogen?
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
Which of the metals copper, zinc, magnesium or sodium would be the most suitable?
Complete and balance the following reaction.
Mg + H2O →_____________ +___________
Starting from hydrogen gas how would you obtain a neutral liquid.
Starting from hydrogen gas how would you obtain a metal by reduction of its heated oxide.
Name an element whsich reacts violently with water at room temperature.
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.
State the reactant added to hydrogen to obtain the respective product in following case.
Ammonia
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
