Question : On a clean glass plate, a drop of water spreads to form a thin layer, whereas a drop of mercury remains almost spherical because:
Option 1: mercury is a metal
Option 2: the density of mercury is greater than that of water
Option 3: the cohesion of mercury is greater than its adhesion with glass
Option 4: the cohesion of water is greater than its adhesion with glass
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Correct Answer: the cohesion of mercury is greater than its adhesion with glass
Solution : The correct option is the cohesion of mercury is greater than its adhesion with glass .
On a clean glass plate, the behaviour of a drop of water spreading and a drop of mercury remaining almost spherical is related to the balance of cohesion and adhesion forces. Mercury's cohesive forces (attraction between mercury molecules) are stronger than its adhesive forces (attraction between mercury and the glass surface).
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