Question 23
Find out the wrong statements and write them in their correct form.
(i) We can survive for some time without air but we cannot survive even for a few minutes without food.
(ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.
(iv) Chlorination is a commonly used chemical method for killing germs in water.
(v) Water which is suitable for drinking is called soft water.

Q.

Question 23
Find out the wrong statements and write them in their correct form.
(i) We can survive for some time without air but we cannot survive even for a few minutes without food.
(ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.
(iv) Chlorination is a commonly used chemical method for killing germs in water.
(v) Water which is suitable for drinking is called soft water.

Q. Humans can survive without water for a few weeks.

Q.

Some desert beetles can live out their life without ever drinking liquid water. They survive on "metabolic water," which

Q. Some desert beetles can survive on " metabolic water", without drinking water which is

Q. Write balanced chemical equations for the following:
(a) burning of coal (carbon) in a sufficient supply of air
(b) When coal burns in insufficient amount of oxygen, carbon monoxide is formed.
(c) Name the type of reaction in each of the above cases.
(d) How is carbon monoxide harmful?