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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. From the given options, Identify A and B.

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A = Al, B = ${Al}_{2} O_{3}$

A = Mg, B = MgO

A = S, B = ${SO}_{2}$

A = Ca, B = CaO

answer is B.

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Detailed Solution

The metal A, which is used in thermite reaction is Aluminium. Aluminium when heated with oxygen forms aluminium oxide.

$4 Al + 3 O_{2} \to 2 {Al}_{2} O_{3}$

Aluminium oxide is amphoteric in nature i.e. it reacts with both acid and base.

${Al}_{2} O_{3} + 3 HCl \to 2 Al {Cl}_{3} + 3 H_{2} O$
${Al}_{2} O_{3} + 2 NaOH \to 2 NaAl O_{2} + H_{2} O$

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