Discussion
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
Answer: C
Because the cohesion of mercury exceeds its adhesion to glass.
A liquid spreads when it is more attracted to the surface than to itself, as water is on clean glass. Mercury's cohesive forces are much stronger, so it draws itself into the shape of least surface area - a sphere - and its meniscus curves upward at the edges rather than down.
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