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Q.14. 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 reactions under which above chemical reaction can be classified.

Dear Student,

Please find below the solutions of your asked query:

(i) Solid A is assumed to be Aluminium (Al) and solid B to be Manganese dioxide (MnO2). When the mixture of MnO2 and Al is heated, Manganese (Mn) is produced in molten state and Aluminium oxide (Al2O3) floats over it. Mn is produced in the molten state as a lot of heat energy is released in the process. Therefore, 'C' is Mn and 'D' is Al2O3.
Reaction Involved-

Al(s) + MnO2(s)  Mn(s) + Al2O3(s)

(ii) The types of reaction under which the above reaction is classified are:
  • Redox reaction
  • Displacement reaction
Hope this information clears your doubts about the topic.

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