Question

Study the given flowchart carefully and identify P and Q respectively.

• A. Compress and cool; Nitrogen
• B. Expand and heat; Argon
• C. Compress and heat; Oxygen
• D. Expand and cool; Oxygen

Answer 1

The correct option is A Compress and cool; Nitrogen

Air is converted to liquid air when it is cooled that is kinetic energy decreases and on compressing when no of molecules per unit volume increases.

$\therefore P$ is compress and cool.

Liquid air is slowly warmed in fractional distillation column and the vapours liquify as they move up.

Oxygen luquifies at $-{183}^{\circ }C$ , at flows out at the bottom. Nitrogen turns back into gas, at its boiling point is $-{196}^{\circ }C$. It flows through the pipe connected at top.

Option: $A$