CBSE Class 10 Science 2020 Delhi Set 2

Question : 9

Total: 10

(a) What is thermit process? Where is this process used? Write balanced chemical equation for the reaction involved.
(b) Where does the metal aluminium, used in the process, occurs in the reactivity series of metals ?
(c) Name the substances that are getting oxidised and reduced in the process.

Solution:

(a) A thermite reaction is the reaction in which the iron oxide (rust) reacts with aluminium to produce molten iron. The reaction of iron oxide (Fe2O3) with aluminium i.e., this thermite process is used to join railway tracks or cracked machine parts. The balanced chemical reaction for the reaction involved is as follows:

Fe2O3( s)+2‌Al( s)→2‌Fe(l)+Al2O3( s)+Heat

(b) Aluminium occurs high up in the reactivity series of the metals and that is why it displaces iron from its salt during the thermite reaction.
(c) Aluminium is being oxidised and iron is reduced in the process.

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