Question 46
A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.
Thermite process is the reduction of metal oxides with aluminium, producing a large amount of heat. This is generally used in the welding of metal parts.
A−Al;B−Al2O3Al2O3(s)+6HCl(aq)→2AlCl3(aq)+3H2O(l)Al2O3(s)+2NaOH(aq)→2NaAlO2(aq)+H2O(l)