JEE Main · 2023 · 01 Feb 2023 · Shift 2 · Hydrogen

The starting material for convenient preparation of deuterated hydrogen peroxide (

D_{2} O_{2}

) in laboratory is:

(A) $K_{2} S_{2} O_{8}$ ✓ Correct
(B)2-ethylanthraquinol
(C) $BaO_{2}$
(D)BaO

Answer: (A)

Solution

Deuterated hydrogen peroxide is made by the route used for ordinary hydrogen peroxide, but with heavy water in place of water. Potassium peroxodisulphate already contains the peroxo

O - O

linkage, and its hydrolysis by

D_{2} O

transfers that linkage intact into the product,

K_{2} S_{2} O_{8} + 2 D_{2} O \to 2KDS O_{4} + D_{2} O_{2}

. The barium peroxide and anthraquinol routes would introduce ordinary hydrogen into the peroxide. The convenient starting material for

D_{2} O_{2}

is potassium peroxodisulphate,

K_{2} S_{2} O_{8}

JEE Main · 2023 · 01 Feb 2023 · Shift 2 · Single correct option

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