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Question

Metal 'X' reacts very slowly with water but reacts vigorously with steam. Identify metal 'X'.

A
Magnesium
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B
Silver
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C
Copper
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D
Potassium
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Solution

The correct option is A Magnesium
  • Magnesium has almost no reaction with cold water. It reacts slowly with hot water to give the slightly soluble magnesium hydroxide and hydrogen.
  • Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. Very clean magnesium ribbon has a very slight reaction with cold water. After several minutes, some bubbles of hydrogen form on its surface, and the coil of magnesium ribbon usually floats to the surface.
  • Hence, option A is correct answer.

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