BITSAT 2017 Slot 2 Solved Paper

Section: Chemistry
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Question : 77 of 150
 
Marks: +1, -0
Consider the following radioactive decays
I. ‌92U
−α
────▸
‌90
Th and
II. ‌90Th
−α
────▸
‌88
Ra

In which case group of parent and daughter elements remains unchange
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