Check sibling questions
Class 10
Chapter 3 Class 10 - Metals and Non-Metals (Term 1)

In a thermite reaction, a compound of iron reacts  with a metal.  

                               

 

(a) The metal used is:   

(i) Zinc 

(ii) Aluminium  

(iii) Magnesium 

(iv) None of these.  

Answer

Aluminium metal is used in thermite reaction .

 

So, the correct answer is (II).



(b) After completion of this reaction, a metal is  obtained in the molten state. Identify the metal:    

(i) Zinc 

(ii) Aluminium  

(iii) Iron 

(iv) Magnesium  

 

Answer

Molten iron is obtained at the end of the reaction.

 

So, the correct option is (iii) Iron



(c) The correct equation to justify thermite reaction is:   

(i) Fe 2 O 3 + 2Al 2Fe + Al 2 O 3 – Heat.  

(ii) Fe 2 O 3 + 2Al 2Fe + Al 2 O 3 + Heat.  

(iii) Al 2 O 3 + 2Fe 2Al + Fe 2 O 3 + Heat.  

(iv) Fe 2 O 3 + 2Al 2Fe + Al 2 O 3  

 

Answer

(ii) Fe 2 O 3 + 2Al 2Fe + Al 2 O 3+ Heat

                          

(d) The correct name for Fe 2 O 3 is:   

(i) Ferrous oxide 

(ii) Ferric oxide  

(iii) Ferrous hydroxide 

(iv) Ferric hydroxide  

 

Answer

  • Ferrous is used from Fe 2+
  • Ferric is used for Fe 3+
  • Here, Fe is oxidised to Fe 3+

Thus, Ferric oxide is the correct name for Fe 2 O 3

So, the correct answer is (II)

 

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