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

density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
mercury is a metal.

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water

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