Colour of KI solution containing starch turns blue when chlorine water is added to it…
Chemistry · Class 12 · CBSE — Haloalkanes and Haloarenes
Colour of KI solution containing starch turns blue when chlorine water is added to it. This happens because
- chlorine displaces iodine from solution which gives blue colour with starch
- chlorine reacts with potassium iodide solution to form a blue precipitate
- iodine which is liberated is more soluble in KI resulting in blue colour
- chlorine acts as bleaching agent which decolourises KI and becomes blue.
Answer
(A) chlorine displaces iodine from solution which gives blue colour with starch
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