Hydrogen peroxide can be prepared from:

NaOH

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Solution

The correct option is B
If the hydrated barium peroxide is treated with cold dilute sulphuric acid (1 vol. of acid: 5 vols. of $H_{2}$ O), or with hydrofluosilicic acid, insoluble barium salts and a solution of hydrogen peroxide are produced:

$B a O_{2} + H_{2} S O_{4} \to B a S O_{4} + H_{2} O_{2}; B a O_{2} + H_{2} S i F_{6} \to B a S i F_{6} + H_{2} O_{2} .$

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