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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn073

Dichlorine heptoxide is the anhydride of an oxyacid. What is the oxidation number of Cl in it, and what is the name of the acid formed with water?

A+5; chloric acid
B+7; perchloric acid
C+7; chloric acid
D+5; perchloric acid

Answer: B

The formula is

Cl X_{2} O X_{7}

with O

- 2

:

2 x = 14

,

x = + 7

.

Cl X_{2} O X_{7} + H X_{2} O 2 HClO X_{4}

, and

HClO X_{4}

(Cl

+ 7

) is perchloric acid.

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