Q.

Adding detergents to water helps in removing dirty greasy stains. This is because 

(a) It increases the oil-water surface tension

(b) It decreases the oil-water surface tension

(c) It increases the viscosity of the solution 

(d) Dirt is held suspended surrounded by detergent molecules

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a

(b) and (d)

b

(d) only

c

a) only

d

(c) and (d)

answer is A.

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Detailed Solution

Detergent decreases the oil-water surface tension and helps in removing dirty greasy stains.

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Adding detergents to water helps in removing dirty greasy stains. This is because (a) It increases the oil-water surface tension(b) It decreases the oil-water surface tension(c) It increases the viscosity of the solution (d) Dirt is held suspended surrounded by detergent molecules