The appreciable radioactivity of uranium minerals is mainly due to [NC

1.	The appreciable radioactivity of uranium minerals is mainly due to [NCERT 1980]
A.	An uranium isotope of mass number 235
B.	A thorium isotope of mass number 232
C.	Actinium
D.	Radium
Answer» E.

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The appreciable radioactivity of uranium minerals is mainly due to [NCERT 1980]

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