Statement-1 : Coefficient of viscosity of a liquid decreases while that of a gas increase, with increasing temperature.
Statement-2 : Density of a liquid and that of a gas vary in opposite manner with increase in temperature.
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Viscosity arises from molecular interactions. In liquids, intermolecular forces dominate; increasing temperature weakens these forces, reducing viscosity. In gases, molecular collisions transfer momentum; higher temperature increases molecular speed and collision frequency, raising viscosity.
Density decreases with temperature for both liquids and gases due to thermal expansion, so Statement-2 is false. The viscosity behavior is due to different mechanisms, not density variation.
Final Answer: Statement-1 is true, statement-2 is false.