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प्रश्न
A metal ______ hydrogen in the reactivity series gives hydrogen with ______.
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उत्तर
A metal above hydrogen in the reactivity series gives hydrogen with dilute acids.
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........................... means ‘maker of water’ in Greek.
Why nitric acid is not used in the preparation of hydrogen?
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Select the correct options for the following statement:
A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.
Select the correct options for the following statement:
The metal which reacts with steam liberating hydrogen & the reaction is reversible.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
Name an element whsich reacts violently with water at room temperature.
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Ca(OH)2 + H2}\]
