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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry2 Marks
Question
Explain oxidation method of preparation of colloids with two examples.
✓

Answer

Oxidation:
1. When hydrolodic acid is treated with iodic acid 12 sol is obtained.
$
HIO _3+5 HI \rightarrow 3 H _2 O +3 I _2 \text { (sol) }
$
2. When $O _2$ is passed through $H _2 Se$, a sol of selenium is obtained.
$
H _2 Se + O _2 \rightarrow 2 H _2 O + Se \text { (sol) }
$

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