New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    When a detergent is added to pure water, its surface

    tension –
    A increases Correct Answer Incorrect Answer
    B decreases Correct Answer Incorrect Answer
    C remains constant Correct Answer Incorrect Answer
    D becomes infinite Correct Answer Incorrect Answer

    Solution

    When Soaps and detergents are added to water, they weaken the strength of the skin on the water's surface due to surface tension by interfering with hydrogen bonding between water molecules. It happens because the polar end of the soap or detergent is also attracted to the water, thereby decreasing the surface tension.

    Practice Next