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Q.

Which of the following when dissolved in water lowers the surface tension of water?

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a

Al2O3

b

Protein

c

Stannic oxide

d

Silica

answer is C.

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Detailed Solution

Sols of Al2O3 and even inorganic lyophilic sols e.g. silica, stannic oxide show no difference in surface tension as compared to water.
If protein is dissolved in water it lowers the surface tension.

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