Question

in brief.
What are the three conditions necessary for combustion to take place?
State a difference between complete and incomplete combustion.
Does the burning of coal produce flame as the burning of wood does?
Why is carbon dioxide used in fire extinguishers?
Classify the fuels on the basis of their use.
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Why are lead compounds harmful to us?
Why is soda-acid fire extinguisher not effective when oil catches fire?
Which of the following compound has least calorific value-biogas, wood, keros
LPG?
Why is LPG labelled as inflammable substance?
a. What is calorific value? Write its unit.
b. In an experiment 5 kg of a fuel was completely burnt. The heat produced wa
measured to be 1,80,000 kJ. Calculate the calorific value of the fuel.
Suppose you are asked to cook rice using cow dung cake, coal and LPG as fuels
duunrefer? Give your reason.​

Answer 1

Answer:

we need oxygen ,fuel and ignition temperature tomake a fire

Explanation:

Answer 2

Answer:

The MAIN THREE CONDITIONS REQUIRED TO COMBUSTION IS OXYGEN,,, FUEL,,,HEAT

THE BURNING COAL PRODUCES SMOKE BUT WOOD PRODUCES FLAME

AS CARBON DIOXIDE is non supportive gas of flame

LEAD COMPUND ARE harmful because it is combustible and harm kidney brain

because oil don't mix with water and spread down