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What do you understand by calorific valu...

What do you understand by calorific value of a fuel. Give the SI unit of of calorific value?

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**Step-by-Step Solution:** 1. **Definition of Calorific Value**: The calorific value of a fuel is defined as the amount of heat energy produced when a specific quantity of the fuel is completely burned in the presence of oxygen. This combustion process releases energy, which can be harnessed for various applications, such as heating or powering engines. 2. **Measurement of Calorific Value**: The calorific value is typically measured for a unit mass of fuel, indicating how much energy can be obtained from burning a certain amount of that fuel. 3. **SI Unit of Calorific Value**: The SI unit of calorific value is expressed in joules per kilogram (J/kg). This unit indicates the amount of energy (in joules) released per kilogram of fuel when it undergoes complete combustion. ...
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  5. Which of these is a solid fuel?

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  8. What changes the colours of the flame of a candle?

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  9. When does a substance produce flame during combustion?

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  10. What is an identifying feature of a carbon dioxide fire extinguisher?

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  11. Which two chemicals react in a soda-acid fire extinguisher?

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  12. Why is the use of water avoided to extinguisher electrical fires?

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  13. How can we extinguish a fire?

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  14. Which of these is an example of incomplete combustion?

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  15. In which reaction a combustible substance reacts with oxygen to give c...

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  16. Why is sodium metal kept under kerosene oil ?

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  17. Which of these is an example of rapid combustion?

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  18. Which of the following is a supporter of combustion?

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  19. Which of these is an inflammable substance?

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  20. Which of these is an example of a non-combustible substance?

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  21. What type of change is combustion?

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