Q41 of 65 Page 24

Compound X and aluminium are used to join railway tracks. (a) Identify the compound X (b) Name the reaction (c) Write down its reaction.

(a) X is Fe2O3.


(b) The name of the reaction is thermite reaction. This is a redox reaction between aluminium and iron (III) oxide that produces molten iron as aluminium is more reactive metal than iron. This reaction is highly exothermic and heat is produced.


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


More from this chapter

All 65 →
39

Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

 40

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?

 42

When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.

 43

A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.