Phosphorus is kept in water to

This question was previously asked in
JTET 2012 (Mathematics & Science) Official Paper-II
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  1. purify water
  2. make water soft
  3. prevent its contact with oxygen
  4. denature it

Answer (Detailed Solution Below)

Option 3 : prevent its contact with oxygen

Detailed Solution

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The correct answer is prevent its contact with oxygen.Key Points

  • Phosphorus is kept in water so that it avoids catching fire through contact from atmospheric oxygen.
  • Phosphorus is the element that literally means "I carry light".
  • Phosphorus is a chemical element with an atomic number 15.
  • It was discovered by Hennig Brand in 1669.
  • Phosphorus has the smell of garlic.
  • Phosphorus is never found as a free element on earth due to its high reactivity.​

Important Points

  • Elemental phosphorus exists in two different forms namely white phosphorus and red phosphorus.
  • White phosphorus emits green light on the exposure to the atmosphere.
  • Red phosphorus is used for making safety matches.
  • Phosphorus is used in the fertilizer industry.
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