Question

Twenty millilitres of a gaseous hydrocarbon required 400 ml of iar for complete cumbustion. The air contains `20%` by explosion and cooling was found to be 380 ml.
Q. Volume of `O_2` used is:
A. 70 ml
B. 75 ml
C. 80 ml
D. 85 ml

Answer 1

Correct Answer - C
Volume of `O_2` used `=(400xx20)/(100)=80ml`