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Which of the following statement is incorrect

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Liquid dinitrogen is used in cryosurgery

$C u + 4 H N O_{3} (c o n c) \to C u {(N O_{3})}_{2} + 2 N O + 2 H_{2} O + O_{2}$

$H_{2} S_{2} O_{8}$ contain peroxy bond

Acidic strength : $H I > H B r > H C l > H F$

answer is B.

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