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Question

An unknown substance 'S' reacts vigorously with cold water, air and Hydrochloric acid. It remains unaffected by Sodium hydroxide base. Identify the substance amongst the following options.

A
Iron
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B
Aluminium
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C
Sodium
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D
Phosphorus
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Solution

The correct option is C Sodium
  • Sodium is a very reactive metal. It reacts vigorously with cold water, air and acids. The reaction with water and acids is violent and the Hydrogen which is evolved as a product may immediately catch fire. Sodium does not react with Sodium hydroxide base.
  • Metals like Aluminium and Iron, which are moderately reactive do not react with cold water. They react with steam to form the metal oxide and Hydrogen.
  • Phosphorous is a non-metal. It does not react with water or acid.

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