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Corrosion

A metal in th...

Question

A metal in the powdered form reacts very slowly with the boiling water, but it decomposes steam.
Name the metal.

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Solution

Magnesium reacts slowly with boiling water and form magnesium hydroxide along with liberation of hydrogen gas. That is,

$M g + 2 H_{2} O (h o t) \to M g (O H)_{2} + H_{2}$
While Magnesium reacts with steam to form magnesium oxide and liberates hydrogen gas.

$M g + H_{2} O (s t e a m) \to M g O + H_{2}$

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