a student was given three powdered materials, which was sugar oil and starch powder in the three packets and forgot to label them. he did not want to take them as it was dangerous. he took boiled water in three beakers and started to add this material into beakers. if a small amount of contents off packet I in beaker I , those of packet II in beaker II and those of packet III in beaker III. He stirred the contents of each beaker without keeping it undisturbed and observed that beaker I gave a translucent solution , beaker beaker II gave a transparent solution while content of beaker III was opaque. Which of the following conclusions will you draw?
options:- a) packet I :- sugar, packet II:- soil, packet III :- starch powder
b) packet I :- starch powder , packet II:- sugar , packet III :- Soil
c) packet I :- soil , packet II :- starch powder , packet III :- sugar
d) none of these.
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Answer:
correct ans is option b.
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Explanation:
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The answer is
b) packet I:- starch powder, packet II:- sugar, packet III:- Soil
Explanation:
Different kinds of substances form different kinds of mixtures in water.
- If a substance can dissolve completely in hot water (like sugar) a clear solution would be obtained. Such a solution is called a true solution.
- Some of the substances cannot dissolve completely in hot water ( like starch), a translucent solution would be obtained. Such a mixture is called a colloid.
- Some substances cannot dissolve at all in water (like soil) and give opaque mixtures, which when kept for a long time may even settle down at the bottom. Such a mixture is called a suspension.
Now,
- In beaker I, a translucent solution is obtained, so packet 'I' is starch.
- In beaker II, a transparent solution is obtained, so packet 'II' is sugar.
- In beaker III, an opaque mixture is obtained, so packet 'III' is soil.
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