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Model Paper 5 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 51 Mark
MCQ
To prepare a colloidal solution of starch, we should:
  • ✓
    add the thin paste of starch to hot water with stirring
  • B
    add starch powder to cold water and boil
  • C
    add the starch powder to boiling water and cool
  • D
    heat starch, add it to cold water and then bring it to boil
✓

Answer

Correct option: A.
add the thin paste of starch to hot water with stirring
(a) add the thin paste of starch to hot water with stirring
Explanation: The colloid of starch is prepared by the dispersion method. 2-3 g of powdered/crushed starch is dissolved in 3-4
ml of water to make a thin paste. This paste is added to100 ml of boiling water while stirring. Allow the solution to cool and
filter. The filtrate is colloid of starch.

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