Question

True or False:
5. In a candle, wax melts and then burns. The change which results in the evolution of heat is the melting of wax. 6. In a candle flame, the innermost part is the hottest and the outermost part is the coolest zone.
7. Every combustible substance is a fuel. 8. Hydrogen has the highest calorific value among all fuels and it has no emissions other than water vapour. 9. Burning of coal in thermal power plants can result in acid rain. 10. Soot, a by-product of combustion, is not harmful for us as it consists of only carbon.​

Answer 1

Answer:

true

true

false

false

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