Write True/False against the following statements and also correct the false statement.
(a) A physical process in which a substance reacts with oxygen to give off heat is called combustion.
(b) Water is the best extinguisher for fires involving electrical equipment.
(c) Alcohol, CNG and LPG are inflammable substances.
(d) Increased concentration of nitrogen in air is believed to cause global warming.
(e) Greater the calorific value, better is the fuel.
(f) Middle zone is the hottest zone of a flame.
(g) The substances which vaporize during burning, give flame.
(a) False
A chemical process in which a substance reacts with oxygen to give off heat is called combustion. It is basically the process of burning any substance.
(b) False
Carbon dioxide is the best extinguisher for fires involving electrical equipment.
(c) True.
This is because, Carbon dioxide has an ability to remove the oxygen from the substance, thereby reduce combustion.
(d) False
Increased concentration of carbon dioxide in air is believed to cause global warming.
(e) True.
Carbon dioxide acts as a pollutant. It is a green house gas.
(f) False
The outer zone is the hottest zone of a flame.
(g) True.