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To calculate the calorific value of coal using bomb’s calorimeter, which of the following compound are formed after the bomb is removed from the calorimeter?

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To calculate the calorific value of coal using bomb’s calorimeter, which of the following compound are formed after the bomb is removed from the calorimeter?

(a) H2S and CO2

(b) H2SO4 and HNO3

(c) H2SO4 and NO2

(d) SO2 and HNO3

The question was posed to me by my school teacher while I was bunking the class.

Question is taken from Determination of Calorific Value of Solid and Non-Volatile Liquid Fuels topic in section Fuels and Combustion of Engineering Chemistry II

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The correct choice is (b) H2SO4 and HNO3

The explanation is: Since the vapours of H2SO4 and HNO3 are formed during combustion of coal, that is why at last the amounts of H2SO4 and HNO3 are calculated to find the gross calorific value of the coal.

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