IIT-JEE 2012 · Paper 2 · Chemistry Q29

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ChemistrySingle correct+3 / -1Question 29 of 60

Passage

Paragraph for Questions 29 and 30

Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

\ce{Cl2O}

\ce{Cl2O7}

\ce{ClO2}

\ce{Cl2O6}

Answer and worked solution

Official answer: A

Bleaching powder is essentially $\ce{Ca(OCl)Cl}$ ; the oxoacid salt component is the hypochlorite, from hypochlorous acid HOCl.

Anhydride. $\ce{2HOCl -> Cl2O + H2O}$ , so the anhydride is $\ce{Cl2O}$ .

(A)

Topics:Oxoacids Group 17

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IIT-JEE 2012 · Paper 2, Chemistry question 29