Aluminium becomes passive when treated with______

C o n c . H_{2} S O_{4}

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C o n c . H N O_{3}

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C o n c . H C l

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d i l . H C l

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Solution

The correct option is A $C o n c . H N O_{3}$
Aluminium becomes passive when treated with Conc $H N O_{3}$ due to formation of ${A l}_{2} O_{3}$ . It forms a protective coating on the surface of the metal.

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Metals like iron, aluminium, cobalt and nickel become passive when treated with pure concentrated nitric acid.

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d i l . H C l

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c o n c . H_{2} S O_{4}

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