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Analytical Chemistry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry3 Marks
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.
✓

Answer

Starch paper turns blue black:
$
2 KI + Cl _2 \longrightarrow 2 KCI + I _2
$
$I _2$ reacts with starch to give blue black colour.
The chlorine liberates iodine from $KI$ and then it is decolourised.

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