When a pinch of salt or any other salt which is soluble in water is added to water, its surface tension
A
increases
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B
decreases
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C
may increase or decrease depending upon salt
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D
None of these
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Solution
The correct option is A increases A highly soluble substance like sodium chloride ordinarily increases the surface tension. But sparingly soluble substances like phenol or soap reduce the surface tension. So correct answer is 'A'.