Science
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
MnO2 (s) + Al(s) ⟶ Mn(l) + Al2O3(s) + Heat
(a) Give reason why the above reaction is known as a thermite reaction.
(b) Identify the substance oxidised and reduced in the above reaction.
(c) Give a reason why Aluminium is preferably used in thermite reactions.
Chemical Reaction
29 Likes
Answer
(a) The reaction is known as thermite reaction because the amount of heat evolved is very large due to which the metal (Mn) produced is in molten state.
(b) Al is oxidised and forms Al2O3
MnO2 is reduced to Mn
(c) Aluminium is highly reactive and is placed above Fe and Mn in the reactivity series. Hence, it reduces MnO2 to Mn and Fe2O3 to Fe and is used in thermite reactions.
Answered By
14 Likes
Related Questions
Refer to the image below and state how the magnetic field pattern indicates regions where the magnetic field is stronger outside the magnet? What happens to the magnetic field when the current in the circuit is reversed?
Study the food chain given below and answer the questions that follow
(a) If the amount of energy available at the third trophic level is 100 joules, then how much energy will be available at the producer level? Justify your answer.
(b) Is it possible to have 2 more trophic levels in this food chain just before the fourth trophic level? Justify your answer.
An element 'M' with electronic configuration 2 8 3 combines separately with Cl-, SO4-2 anions. Write the chemical formulae of the compounds formed. Predict with the suitable reason the nature of the bond formed by element 'M' in general. How will the electrical conductivity of the compounds formed vary with respect to 'M'?
A reddish-brown metal 'X', when heated in air, gives a black compound 'Y', which when heated in presence of H2 gas gives 'X' back. 'X' is refined by the process of electrolysis; this refined form of 'X' is used in electrical wiring.
Identify 'X' and 'Y'. Draw a well-labeled diagram to represent the process of refining 'X'.