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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.
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.
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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.
- 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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