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An atomic nucleus `._90 Th^232` emits several `alpha` and `beta` radiations and finally reduces to `._82 Pb^208`. It must have emitted.

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An atomic nucleus `._90 Th^232` emits several `alpha` and `beta` radiations and finally reduces to `._82 Pb^208`. It must have emitted.
A. `6,4`
B. `4,6`
C. `8,6`
D. `6,8`
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Correct Answer - A
`._(90)Th^(232)rarr._(82)Pb^(208)+6._(2)He^(4)+4._(-1)e^(0)`
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