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Question
Write the observation, and balanced equation for the following reaction:
Moist starch iodide paper is placed at the mouth of a test tube containing chlorine gas.
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Solution
Starch paper turns blue black :
\[\ce{2KI + Cl2 -> 2KCI + I2}\]
I2 reacts with starch to give blue black colour.
The chlorine liberates iodine from KI and then it is decolourised.
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