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CBSE Class 10 Answered

how a substance can burn in absence of air if oxygen is necessary for combustion( as in calcination)??
Asked by indrayani | 25 Aug, 2010, 12:00: AM
Expert Answer
In calcination the carbonate ores in absence of air decompose to form metallic oxides and carbondioxide
Combustion requires oxygen gas either from the air or that which is released from chemicals used in a reaction. When a chemical reaction takes place without oxygen but still shows burning, it is because the reaction is excessively exothermic i.e., it generates excessive heat, which carries the reaction forward and completes it, without the need for oxygen 

Answered by | 26 Aug, 2010, 10:03: AM
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