किस गैस को नोबल गैस कहा जाता है?

DoThe Best
By DoThe Best June 8, 2015 11:16

 

  • आक्सीजन
  • हाइड्रोजन
  • हीलियम
  • नाइट्रोजन

उत्तर : हीलियम

 

DoThe Best
By DoThe Best June 8, 2015 11:16
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