1.

A metal A, which is used in thermit process, when heated with oxygen gives an oxide B,which is amphoteric in nature. Identify A and B.Write down the reaction of oxide B with HCl and NaOH.

Answer»

Solution :A is aluminium (Al). It REACTS with OXYGEN to FORM aluminium OXIDE `Al_2O_3`.
`4Al(s) +3O_2(g) to 2Al_2O_3(s)`
So, B is `Al_2O_3`.
`Al_2O_3+6HCl to2AlCL_3+3H_2O`
`Al_2O_3+2NaOH to 2NaAlO_2+H_2O`


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