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प्रश्न
Complete and balance the following reaction.
Ca + H2O →_____________ +___________
उत्तर
Ca + 2H2O → Ca(OH)2 + H2
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ...................soluble in water.
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
Why are the following metals not used in the lab. preparation of hydrogen?
aluminium
Why are the following metals not used in the lab. preparation of hydrogen?
sodium
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + NaOH →_____________ +___________
‘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:
A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Fe3O4 + H2}\]
