Ncert Exercises & Solutions

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

{O_{2}}^{2 -}

represents a peroxide ion

{O_{2}}^{-}

represents a superoxide ion

(i) Peroxide ion react with water to forms

H_{2} O_{2}

{O_{2}}^{2 -} + 2 H_{2} O \to 2 {OH}^{-} + \underset{Hydrogen}{H_{2} O_{2}}

peroxide

(ii) Superoxide ion react with water to form

H_{2} O_{2}

and

O_{2}

2 {O_{2}}^{-} + 2 H_{2} O \to 2 {OH}^{-} + \underset{Hydrogen}{H_{2} O_{2}}

peroxide + O_{2}