Advertisements
Advertisements
Question
Explain the preparation of hydrogen using electrolysis.
Advertisements
Solution
High purity of hydrogen (>99.9%) is obtained by the electrolysis of water containing traces of acid or alkali or electrolysis of an aqueous solution of sodium hydroxide or potassium hydroxide using a nickel anode and iron cathode. This process is not economical for large-scale production.
- At anode: \[\ce{2OH^- -> H2O + 1/2O2 + 2e^-}\]
- At cathode: \[\ce{2H2O + 2e^- -> 2OH^- + H2}\]
- Overall reaction: \[\ce{H2O -> H2 + 14O2}\]
APPEARS IN
RELATED QUESTIONS
A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that
Mention the uses of deuterium.
Why does \[\ce{H+}\] ion always get associated with other atoms or molecules?
Hydrogen peroxide is ______.
Which of the following statement(s) is/are correct in the case of heavy water?
(i) Heavy water is used as a moderator in nuclear reactor.
(ii) Heavy water is more effective as solvent than ordinary water.
(iii) Heavy water is more associated than ordinary water.
(iv) Heavy water has lower boiling point than ordinary water.
How is heavy water prepared? Compare its physical properties with those of ordinary water.
Rohan heard that instructions were given to the laboratory attendent to store a particular chemical i.e., keep it in the darkroom, add some urea in it, and keep it away from dust. This chemical acts as an oxidising as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents. Write the name of this compound. Explain why such precautions are taken for storing this chemical.
H2O2 can be obtained when the following reacts with H2SO4 except with:
The volume of '10 Vol' of H2O2 required to liberate 500 mL O2 at NTP is ______.
In a basic medium, H2O2 exhibits which of the following reactions?
(A) \[\ce{Mn^{2+} -> Mn^{4+}}\]
(B) \[\ce{I2 -> I^-}\]
(C) \[\ce{PbS -> PbSO4}\]
Choose the most appropriate answer from the options given below.
