No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D floats over it. It was observed that the reaction is highly exothermic.(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.(ii) Mention any two types of reaction under which above chemical reaction can be classified.
(i) Based on the given information, solid A can be assumed to be manganese dioxide (MnO2) and solid B can be assumed to be aluminium powder (Al). When manganese dioxide is heated with aluminium powder, the following reaction takes place:
$3MnO_2 (s) + 4Al(s) \xrightarrow{heat} 2Al_2O_3(s)+ 3Mn (l)+ Heat$
A B D C
It is a highly exothermic reaction and a lot of heat is evolved.
(ii) The above reaction can be classified as:
- Displacement reaction (as manganese is displaced from its oxide by aluminium)
- Exothermic reaction (as a lot of heat is evolved)
- Redox reaction (as Manganese is reduced by removal of oxygen and Aluminium is oxidised by addition of oxygen)
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