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

रशियन रसायनशास्त्रज्ञ दिमित्री इव्हानोविच मेंडेलीव्हच्या वेळी ज्ञात मूलद्रव्यांची संख्या किती होती?

1
57
2
53
3
63
4
67
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