Question

Which of the following is not a colloid?
(a)starch in water (b) sulphur in CS2(C) soap solution (d) petrol in CS2​

Answer 1

Answer:

(d) petrol in CS2

Explanation:

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Answer 2

Sulphur in CS2 is not a colloid.

• (b) sulphur in CS2 is the correct option.
• A colloid is a mixture where one substance is dispersed throughout another substance in very small particles or droplets. It is so small that it cannot be seen by the naked eye.
• Starch in water, soap solution, and petrol in CS2 are all colloids because they are mixtures of two substances with one being dispersed within the other at small particle sizes.
• Sulphur in CS2 however is not a colloid since the two substances are not separated.
• Sulphur in CS2 does not fit this definition, as the substances are not divided into small particles. Instead, the sulphur is dissolved in the CS2.

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