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Question
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
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Solution
- Electrolysis : “Dissociation of water into hydrogen gas and oxygen gas by the passage of electric current is called electrolysis.”
\[\ce{2H2O ⇌[Electricity][Current] 2H2 + O2}\]
- Electrolyte : “A chemical compound (water) in solution state which conducts electric current and decomposes is called electrolyte.”
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sodium
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Na + H2O →_____________ +___________
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Al + H2SO4 →_____________ +___________
Complete and balance the following reaction.
Zn + NaOH →_____________ +___________
Complete and balance the following reaction.
Al + KOH + H2O→_____________ +___________
Select the correct options for the following statement:
The product formed on combustion of hydrogen in air is ___.
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An efflorescent substance which leaves a residue having the same colour as the substance and evolves a gas which changes the colour of cobalt chloride paper.
Account for the following fact:
Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
