Given below are two statements.

Statement I : Viscosity of liquid decreases with increase in temperature.

Statement II : The units of viscosity are $\mathrm{kg} \mathrm{m}^{-1} \mathrm{~s}^{-1}$.

The correct answer is

Identify the correct variation of pressure and volume of a real gas $$(A)$$ and an ideal gas ($$B$$) at constant temperature. $$(y=p ; x=V)$$

The gaseous mixture used for welding of metals is

Among the gases a, b, c , d, e and f, the gases that show only positive deviation from ideal behaviour at all pressures in the graph are