A) \[{{H}_{2}}{{O}_{2}}\]is a weak acid
B) \[{{H}_{2}}{{O}_{2}}\]is a weak alkali
C) \[{{H}_{2}}{{O}_{2}}\]acts as an oxidising agent
D) \[{{H}_{2}}{{O}_{2}}\]is a reducing agent
Correct Answer: B
Solution :
\[{{H}_{2}}{{O}_{2}}\]is slightly stronger acid than water, it forms two series of salt, \[{{H}_{2}}{{O}_{2}}{{H}^{+}}+HO_{2}^{-}\] (hydroperoxide ion) \[{{H}_{2}}{{O}_{2}}2{{H}^{+}}+O_{2}^{2-}\](peroxide ion) \[{{H}_{2}}{{O}_{2}}\]behaves as oxidising as well as reducing agent in acid and basic medium. In acid medium, \[{{H}_{2}}{{O}_{2}}+2{{H}^{+}}+2{{e}^{-}}\xrightarrow{{}}2{{H}_{2}}O\] In basic medium, \[{{H}_{2}}{{O}_{2}}+O{{H}^{-}}+2{{e}^{-}}\xrightarrow{{}}3O{{H}^{-}}\] As reducing agent In acid medium, \[{{H}_{2}}{{O}_{2}}\xrightarrow{{}}2{{H}^{+}}+{{O}_{2}}+2{{e}^{-}}\] In alkaline medium, \[{{H}_{2}}{{O}_{2}}+2O{{H}^{-}}\xrightarrow{{}}2{{H}_{2}}O+{{O}_{2}}+2{{e}^{-}}\]
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