7) (a) Write two outcomes of incomplete combustion.
(b) Why are gaseous fuels considered as the best? Write any three points.
Answers
Explanation:
(a) Incomplete combustion occurs when the supply of air or oxygen is poor. Water is still produced, but carbon monoxide and carbon are produced instead of carbon dioxide.
The carbon is released as soot. Carbon monoxide is a poisonous gas, which is why incomplete combustion is not preferred.
(b) Gaseous fuels are
• Easy and convenient to handle.
• Generally free of any mineral impurities.
• Require low or negligible maintenance of burners and result in good combustion efficiencies.
Explanation:
Incomplete combustions occurs when there isn't enough oxygen to allow the fuel to react completely with it to produce carbon dioxide and water.
The outcomes are
Water is still released. The realease of carbon monoxide leading to air pollution. The carbon is released as soot which is not good for enviroment.
The incomplete combustion also tends to release less heats and hence leads to wastage of fuels.
Gaseous fuels are considered to be best because:
1. During their combustion no ash is remained as they have high calorific value i.e. 100 percent combustion take place easily.
2. It also deals a very large amount of energy while producing a very little air pollution.
3. They are easy and convenient to handle, generally free of any mineral impurities, requires low or negligiable maintenance of burners and result in good combustion efficiency.