engineering recuitment UPCL AE (E&M) 2021 Mock Test General Science Chemistry Classification of Elements and Periodicity in Properties

आधुनिक आवर्त सारणीच्या कोणत्या गटातील सर्व मूलद्रव्ये वायू आहेत? 

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गट 18
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गट 10
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गट 12
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गट 14
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