हिंदी
सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

‘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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प्रश्न

‘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’.

टिप्पणी लिखिए
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उत्तर

  • 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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Preparation of Hydrogen
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अध्याय 7: Hydrogen - Exercises

संबंधित प्रश्न

A metal ______ hydrogen in the reactivity series gives hydrogen with ______.


FILL IN THE BLANK

In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.


Complete and balance the following reaction.

Ca + H2O →_____________ +___________


Complete and balance the following reaction.

Al + H2SO4 →_____________ +___________


‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,

Name the electrode –

  1. through which the current enters the electrolyte.
  2. at which hydrogen is liberated.

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.


Complete and balance the equation:

[General method]

Reactions of metals with steam

Magnesium - Mg + H2O → ______+ _______ [g]


Complete and balance the equation:

[General method]

Reactions of metals with steam

Aluminium - 2Al + 3H2O → ______+ _______ [g]


Give a balanced equation for the following conversion.

\[\ce{CO + H2<-H2O->CO2 + H}\]


Give a reason for the following.

Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.


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