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Preparation of Bromine and Iodine

Br2 turns sta...

Question

$B r_{2}$ turns starch iodide paper :

A

blue

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B

red

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C

colourless

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D

yellow

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Solution

The correct option is A blue
The bromine releases iodine from the potassium iodide Iodine reacts with starch to produce a blue color.
$B r_{2} + K I \to K B r + I_{2}$
Hence option A is correct

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Q. Chlorine turns moist starch iodide paper blue black. Why?

H_{2} O_{2}

turns starch iodide paper to green colour.
If this is true enter 1, if false enter 0.

K_{2} C r_{2} O_{7}

turns starch iodide paper to blue colour.
If this is true enter 1, if false enter 0.

Q. Assertion :When moist starch iodide paper comes in contact with chlorine, it turns blue back. Reason: Free iodine is liberated from potassium iodide.

Q. Which of the following gases turns starch iodide paper blue?

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