The addition of soap in water:

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(B) Soap molecules are surfactants,which consist of a long hydrophobic hydrocarbon chain and a hydrophilic polar head group. When soap is added to wat

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decreases its surface tension

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(B) Soap molecules are surfactants,which consist of a long hydrophobic hydrocarbon chain and a hydrophilic polar head group. When soap is added to water,these molecules accumulate at the surface,with the hydrophobic tails pointing away from the water. This arrangement disrupts the cohesive forces between water molecules at the surface,thereby reducing the surface tension of the water. This reduction in surface tension is what allows soap to act as a cleaning agent by enabling water to penetrate into fabrics and emulsify dirt.

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