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Four substances were thoroughly mixed with water separately to obtain mixtures A, B, C and D. Some of their properties give below.
I) Path of a beam of light passing through it was visible in A, B and D but invisible in C.
II) On leaving undisturbed, the particles of the substance settle down in A but not in B, C and D.
III) The solute particles are visible to naked eye in A but invisible in B, C and D.
Which of the following is correct about A, B, C and D?

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A, B and D are colloids. C is a solution

A is a suspension. B and D are colloids. C is a solution

A is a colloid. B, C and D are solutions.

A is a suspension B, C and D are colloids

answer is B.

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Detailed Solution

A is a suspension. B and D are colloids. C is a solution

On leaving undisturbed, the particles of the substance settle down in A, so it is suspension.

Path of a beam of light passing through it and light is invisible in C. so it is a solution.

Path of a beam of light passing through B and D was visible in B and D.

On leaving undisturbed, the particles of the substance not settle down in B and D. So, B and D are colloids.

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