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Answers
Answer:
please mark it as brainliest... ^_^
Explanation:
ans1. a) burning of wood and coal causes pollution of air.
b) a liquid fuel, used in homes is liquified petroleum gas (LPG).
c) Fire produced by oil cannot be controlled by water.
ans2. a) The use of CNG (Compressed natural Gas) in automobiles has reduced pollution in our cities as combustion of CNG produces very small amounts of harmful products compared to diesel and petrol. Therefore, CNG is a cleaner fuel.
b) it is in the image...
c) Carbon dioxide extinguishes work by displacing oxygen, or taking away the oxygen element of the fire triangle. The carbon dioxide is also very cold as it comes out of the extinguisher, so it cools the fuel as well.
d) The process of rusting cannot be called combustion due to the following reasons :
No energy is obtained in a rusting process.
Combustion is a chemical process in which a combustible substance reacts with oxygen to produce heat and light whereas in rusting, a metal reacts with oxygen to produce metallic oxide.
ans3. a) LPG has more calorific value and produces no pollution. So it is better domestic fuel than wood.
ans4. a) The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel.
Heat produced by 4.5 kg of fuel =180000 kJ.
Heat produced by 1 kg fuel =
4.5
180000
=40000 kJ/kg.
Hence, the calorific value of the fuel is 40,000 kJ/kg.
ans5. a) it is in picture...
