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

वातावरणात कोणता निष्क्रिय वायू आढळत नाही?

1
आरगॉन 
2
क्रिप्टोन 
3
झेनॉन 
4
रेडॉन 
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