Ozone is estimated/detected by passing the gas into neutral KI solution containing freshly prepared starch paste. The result is

JEE Main Chemistry question

Ozone is estimated/detected by passing the gas into neutral solution containing freshly prepared starch paste. The result is

(A)No visible change occurs, since does not react with
(B)The solution turns a deep blue-black colour, as liberates from , which complexes with starchCorrect
(C)The solution turns brown due to formation of
(D)The starch is bleached white by the oxidising action of

Answer: (B)

Ozone oxidises iodide to iodine even in neutral solution, , and the liberated immediately forms its

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Question ID VK-146694