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Select the CORRECT statement (s).

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In the manufacture of $H_{2} O_{2}$ by electrolysis a mixture of conc. $H_{2} S O_{4}$ and ${(N H_{4})}_{2} S O_{4}$ is used as electrolyte, $H_{2} O_{2}$ is formed at anode and $H_{2}$ is liberated at cathode.

Oxidation state of sulphur in Marshall’s acid and caro’s acid is same.

Peroxides and super oxides on treatment with ice cold dilute acid give $H_{2} O_{2}$

In butterfly structure of $C r O_{5}$ , there are two peroxy bonds.

answer is B, C, D.

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Detailed Solution

$H_{2} S O_{5}$ Caro’s acid +6
$H_{2} S_{2} O_{8}$ Marshall’s acid +6
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