state gov Bihar Police Prohibition Constable 2022 Mock Test Series General Science Chemistry Basic Concepts of Chemistry

खालीलपैकी कोणते क‍िरणोत्‍सारी मूलद्रव्‍य नाही?

1
थोर‍ियम
2
युरोन‍ियम
3
रेड‍ियम
4
सोड‍ियम
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