11 and 12 need urgently I will Mark BRAINLIEST ANSWER
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11. ans:-Calorific value: The amount of heat energy released on complete combustion of 1 kg of a fuel is called calorific value.
It is expressed in a unit called kilo joule per kg (kJ/kg).
Calorific value = heat produced / weight of fuel used in Kgs
Heat produced = 180000 kJ
Weight of the fuel used in Kgs = 4.5
Calorific value = 180000/ 4.5
= 40000 kJ/kg
12.ans:- The process of rusting cannot be called combustion because in this process no heat and light is produced. Due to this reason iron is not considered as combustible substance
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