Q.

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

A. Mercury is a metal
B. Density of mercury is greater than that of water
C. Cohesion of mercury is greater than its adhesion with glass
D. Cohesion of water is greater than its adhesion with glass
Answer» C. Cohesion of mercury is greater than its adhesion with glass
Explanation: When liquid is placed on a smooth surface like glass plate, the relative strengths of the cohesive and adhesive forces acting on that liquid determine the shape it will take (and whether or not it will wet the surface). If the adhesive forces between a liquid and a surface are stronger, they will pull the liquid down, causing it to wet the surface.
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