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Explain the following observation: a. ...

Explain the following observation:
a. Lyphilic colloid is more stable than lyophobic colloid.
b. Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric hydroxide.
c. Sky appears blue in colour.

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The lyophilic colloidal sols are more stable because they are highly hydrated in solution .
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