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  • 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

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

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Ans.
Thermite Reaction:
4Al+3O_{2}\rightarrow 2Al_{2}O_{3}\left ( s \right )
Metal A is aluminum (Al) which is used in thermite process.
Al reacts with oxygen to form aluminum oxide Al­2O3which is amphoteric in nature. So B is Al­2O3
(i) Al_{2}O_{3}\left ( s \right )+6HCl\left ( aq \right )\rightarrow 2AlCl_{3}\left ( aq \right )+3H_{2}O\left ( l \right )
(ii) Al_{2}O_{3}\left ( s \right )+2NaOH\left ( aq \right )\rightarrow 2NaAlO_{2}\left ( aq \right )+H_{2}O\left ( l \right )

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