On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because?

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  1. Mercury is a metal
  2. Density of mercury is greater than that of water
  3. Cohesion of mercury is greater than its adhesion with glass
  4. Cohesion of water is greater than its adhesion with glass

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Answer: Option 3

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because cohesion of mercury is greater than its adhesion with glass.

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