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Standard XII

Chemistry

Brownian Motion

Beaker A ha...

Question

Beaker $A$ has sugar mixed with water and Beaker $B$ has starch dissolved in water.
i) Which solution will scatter light?
ii) In which beaker does the Brownian movement take place?
iii) Name the type of solution that beaker $A$ and beaker $B$ contain.
iv) Which of the two solutions is homogeneous?
v) Identify the beaker that has particles of size $10 \circ A$ to $2000 \circ A$

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Solution

(i) Colloidal solution scatters light. Beaker B, which has a colloidal solution, will do so.
(ii) Beaker B, having a colloidal solution, will have Brownian movement.
(iii) Sugar dissolves completely in water. Hence Beaker A has a true solution. Beaker B has a colloidal solution of starch in water.
(iv) Since sugar in water is a true solution, it is also a homogeneous solution.
(v) A true solution has particles of size $10 o A$ to $2000 o A$ . Hence Beaker A will have such particles.

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