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Question
‘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.
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Solution
- Electrode through which current enters the electrolyte is anode.
- Electrode at which hydrogen is liberated is cathode.
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Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
Which of the metals copper, zinc, magnesium or sodium would be the most suitable?
Correct the following statement:
Hydrogen is separated from CO by passing the mixture through caustic potash solution.
Account for the following fact:
Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Ca(OH)2 + H2}\]
