Question

2 neutral gases one of which is oxygen which combines to give a coloured acidic gas

Answer 1

Hey Friend,

There are basically two coloured gases - chlorine and nitrogen dioxide.

Since this gas is formed two gases one of which being oxygen, the gas is Nirtogen Dioxide.

Reactants - NO and O2 (neutral gases)

Product - NO2

Observation - the gas formed is Reddish brown in colour.

Reaction - 2NO + O2 ---> 2NO2

Hope it helps!