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A metal A, which is used in thermite pro...

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. 

Text Solution

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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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