railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Periodic Table

पुढीलपैकी कोणत्या वायूला 'अनोळखी' वायू असे म्हणतात?

1
झेनॉन
2
निऑन
3
क्रिप्टोन
4
अर्गॉन
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