Which process is the reverse of deposition

Sublimation

Explanation:

Deposition is the process in which a gas transforms into a solid without passing through the liquid phase.

In the opposite process, a solid transforms into a gas without passing through the liquid phase. This process is called sublimation.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.