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Nitric Acid

When a pinch ...

Question

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'.

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