Q31 of 53 Page 130

Complete the following reactions

(i) O2-2 + H2O →


(ii) O-2 + H2O →


(i) Peroxide ions react with H2O to form hydrogen peroxide.

O22- + 2H2O → H2O2 + 2OH-


(ii) Superoxide ions react with H2O to form hydrogen peroxide and O2.


O2- + 2H2O → H2O2 + O2 + 2OH-


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How do you account for the strong reducing power of lithium in aqueous solution?

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When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.

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Lithium resembles magnesium in some of its properties. Mention two such properties and give reasons for this resemblance.

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Name an element from Group 2 which forms an amphoteric oxide and a water soluble sulphate.