railway RRB Junior Stenographer (Ministerial and Isolated Categories) Mock Test General Science Chemistry Periodic Table

वायुमंडल में कौन सी निष्क्रिय गैस नहीं पाई जाती है?

1
आर्गन
2
क्रिप्टॉन 
3
जिनान  
4
रैडॉन
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