Q.

Read the following statements and identify correct statement (s)

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An Intiative by Sri Chaitanya

a

Hot soup tastes better than cold soup, because the surface tension of liquids increases with temperature

b

Surface energy is numerically equal to surface tension per unit area
 

c

On mixing partial soluble impurities like detergents in water, the surface tension of water decreases
 

d

The substances which increases cohesive force between liquid molecules increases surface tension and those decreases cohesive force, decreases the surface tension

answer is B, C.

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Detailed Solution

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Surface tension is caused by the cohesive forces between water molecules at the surface. When substances like detergents are added, they interfere with these cohesive forces by breaking up the hydrogen bonds between water molecules at the surface.

Detergents are amphiphilic molecules, meaning they have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts. The hydrophilic part tends to interact with water molecules while the hydrophobic part tends to disrupt the hydrogen bonding between water molecules at the surface.

Substances that strengthen the cohesive forces between liquid molecules tend to increase the surface tension of the liquid. This happens because these substances encourage stronger interactions among the molecules at the surface, causing them to pull together more tightly.

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