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प्रश्न
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
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उत्तर
- In free state : In traces in the earth’s crust and atmosphere and in volcanic gases. It is also found in huge amount in the interior of the sun.
- In combined state : In organic compounds, plant and animals, in acids, in water.
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Multiple Choice Question
The metal which reacts with cold water to produce hydrogen is
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
For laboratory preparation of hydrogen, give the following:
fully-labeled diagram
How did the name 'hydrogen' originate?
Why are the following metals not used in the lab. preparation of hydrogen?
aluminium
Complete and balance the following reaction.
Fe + HCl →_____________ +___________
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.
Give a balanced equation for obtaining hydrogen from?
Steam using a metal – and the reaction is reversible.
Give a reason for the following.
Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.
