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प्रश्न
Give reason for the following:
In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified.
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उत्तर
Pure or distilled water is bad conductor of electricity and does not form ions. To increase the number of H+ ions distilled water is acidified and made good conductor of electricity.
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संबंधित प्रश्न
A metal ______ hydrogen in the reactivity series gives hydrogen with ______.
For laboratory preparation of hydrogen, give the following:
materials used
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
Complete and balance the following reaction.
Al + H2SO4 →_____________ +___________
Complete and balance the following reaction.
Zn + NaOH →_____________ +___________
Give reason:
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Aluminium - 2Al + 3H2O → ______+ _______ [g]
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
