which of the folowing is not a combination reaction 1 . reaction of hydrogen with nitrogen
2.reaction of quick lime in water
combustion of magnesium in air
4.heating of limestone
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Answer:
4. heating of limestone
Explanation:
heating of limestone is a decomposition reaction
CaCO3(s)→(heat)→Ca O(s)+CO2(g)
limestone when heated becomes Quicklime
this is an example of thermal decomposition.
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