Twenty millilitres of a gaseous hydrocarbon required 400 ml of air for complete combustion. The air contains 20% by volume of oxygen. The volume of gaseous mixture after explosion and cooling was found to be 380ml.
Volume of residual nitrogen is:

Options

A. 300 ml
B. 310 ml
C. 320 ml
D. 330 ml

Answer

C

Explanation

Volume of residual N = (400–80)=320 ml