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प्रश्न
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
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उत्तर
The end of the thistle funnel should be dipped under acid so as to prevent the gas from escaping from the thistle funnel.
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
Why nitric acid is not used in the preparation of hydrogen?
How did the name 'hydrogen' originate?
Why are the following metal not used in the lab. preparation of hydrogen?
iron
Complete and balance the following reaction.
Fe + H2O →_____________ +___________
Give reason:
A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
‘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.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [g]
State the reactant added to hydrogen to obtain the respective product in following case.
Water
