Out of the following gases under similar condition of temperature and pressure, the velocity of sound will be maximum in

Under similar conditions of temperature and pressure, in which of the gases the speed of sound will be the greatest?

A gas mixture contains acetylene and carbondioxide. 20 litres of this mixture requires 20 litres of oxygen for complete combustion. If all gases are measured under similar conditions of temperature and pressure, the percentage of acetylene in the mixture is

Under similar conditions of temperature and pressure, In which of the following gases the velocity of sound will be largest :-