किस खनिज से रेडियम प्राप्त – McqOptions

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1.	किस खनिज से रेडियम प्राप्त किया जाता था -
A.	चूना पत्थर
B.	पिचब्लेंड
C.	रुटाइल
D.	हेमेटाइट
Answer» C. रुटाइल

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