List 2 precautions:while preparing a colloidal solution of starch
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1)The apparatus to be used should be clean
2)Distilled water should be used for preparing sol.in water
3)Starch should be converted into fine paste before adding it to boiling water
4)Starch paste should be added in a thin stream to boiling water
2)Distilled water should be used for preparing sol.in water
3)Starch should be converted into fine paste before adding it to boiling water
4)Starch paste should be added in a thin stream to boiling water
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