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Chemical Properties of H2O2 is considered one the most difficult concept.
45 Questions around this concept.
(a)
(b)
Role of hydrogen peroxide in the above reactions is respectively:
Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H2O2 acts as a reducing agent in acid medium ?
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(i)
(ii)
Role of hydrogen peroxide in the above reactions is respectively -
Hydrogen peroxide is an important chemical used in pollution control treatment of domestic and industrial effluents.
It can be prepared by the following methods.
Various physical properties of hydrogen peroxide are as follows:
It acts as an oxidising as well as reducing agent in both acidic and alkaline media. Simple reactions are described below.
The vapour density as determined by Victor Meyer method at 90oC is 17. Hence, the molecular mass of H2O2 is 34. This value has been confirmed by depression of the freezing point method also. Thenard found that 17 parts by mass of hydrogen peroxide give 9 parts by mass of water and 8 parts by mass of oxygen. Thus the empirical formula is OH and the molecular is H2O2.
The calculated value of the single bond O-O distance is 1.48 and X-ray measurements do show that in hydrogen peroxide, O-O bond distance is 1.46
0.03
. The value of the dipole moment of H2O2 is 2.1D. This suggests that all four atoms do not lie in the same plane. The molecule can be pictured as lying on the spine of a book open to an angle of 94o. The hydrogen atoms are present one on each cover and H-O bonds making angles of 97o with the O-O bond as shown in the figure given below
Structure of H2O2 is slightly different in gas phase and crystalline phase.
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