railway RRB Technician Grade 3 Mock Test 2024 General Knowledge Science Technology and Inventions

1766 मध्ये हेन्री कॅव्हेंडिश यांनी ____________चा शोध लावला.

1
ऑक्सिजन
2
हायड्रोजन
3
हेलियम
4
क्लोरीन
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