What happens when metallic aluminium reacts with concentrated solution of Potassium hydroxide?

K A l (O H)_{4}

formed

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A l (O H)_{3}

formed

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A l_{2} O_{3}

formed

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None of these

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Solution

The correct option is A $K A l (O H)_{4}$ formed
When metallic aluminium reacts with concentrated solution of Potassium hydroxide, $K A l (O H)_{4}$ is formed along with the evolution of Hydrogen gas. The reaction can be given as-
$2 A l$ $+$ $2 K O H$ $+$ $6 H_{2} O$ $=$ $2 K A l (O H)_{4}$ $+$ $3 H_{2}$

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H_{2} S O_{4}

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