रेडॉन का समस्थानिक क्या है – McqOptions

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1.	रेडॉन का समस्थानिक क्या है ?
A.	थोरोन
B.	फीनाॅॅल
C.	बैकन
D.	कैैलोसम
Answer» B. फीनाॅॅल

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