Correct Answer - Option 3 : [MT
-2]
Concept:
Surface tension:
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Surface tension is the property by virtue of which liquid tires to minimize its free surface area.
- In spherical shape the surface area is minimum and for this reason, the raindrops are spherical.
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Surface tension is measured as the force acting per unit length of an imaginary line drawn on the liquid surface.
\(Surface\;tension = \frac{{Force}}{{length}}\)
Two factors can affect the surface tension of a liquid. The factors are-
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Temperature: If temperature increases then the surface tension of a liquid decreases.
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Soluble Impurities: In the case of less soluble impurities, the surface tension decreases. But, for highly soluble impurities in the liquid the surface tension increases.
Explanation:
we know that,
\(Surface\;tension = \frac{{Force}}{{length}}\)
Dimensional formula for surface tension is -
\(Surface\;tension = \frac{{Force}}{{length}}=\frac{[ML{T}^{-2}]}{[L]}=[M{T}^{-2}]\)
