Brown nitrogen dioxide gas (NO2) splits up reversibly to form oxygen gas and colourless nitrogen monoxide gas (NO):
2NO2(0)
2 NO) + O2(0) AH = +114kJ mol-1

(A) Use this principle to predict and explain what happens to the
proportion of nitrogen dioxide splitting up if you (i) increase
the temperature (ii) increase the pressure.
(B) Suggest what would happen to the appearance of the mixture
as you increased the temperature at constant pressure, and
explain your answer.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.