ScienceWhich of the following non-metals reacts and catches fire on exposure to air?

Which of the following non-metals reacts and catches fire on exposure to air?


  1. A
    Phosphorous 
  2. B
    Nitrogen 
  3. C
    Sulphur
  4. D
    Hydrogen  

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    Solution:

    Phosphorous is a non-metal that reacts and catches fire on exposure to air. Many metals catch fire on exposure to air. But there are some non-metals, too, which are highly reactive and flammable. For example, phosphorus explosively reacts with oxygen and catches fire. It mainly exists in three forms; red, white, and black. Out of these, white phosphorus is the most reactive. The reaction is:
    P4(s)+5O2(g)→2P2O5(s)
     
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