Question

23.
why is there so much emphasis on changing over from petrol/diesel driven automobiles to
CNG-driven vehicles.
24.
a) Write the name given to bases that are highly soluble in water. Give an example. -
b) How is tooth decay related to pH ? How can it be prevented?
c) Why does bee sting cause pain and irritation ? Rubbing of baking song the sting area
gives relief. How?​

Answer 1

Answer:

There is so much emphasis on changing over from petrol /diesel driven automobiles to CNG driven vehicles, because of the following reasons:

(i) It does not produce smoke.

(ii) On burning CNG it produces $CO_{2}$ and water.

(iii) It does not leave inburnt hydrocarbons, lead particulates etc., which pollute the environment.