A radioactive element A decays by the sequence and with half-lives given below:Aα30min⟶B2β2 days ⟶CWhich of the following statements about this system are correct?
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a
The mass number of B is greater than A.
b
After two hours, less than l0% of the initial A is left.
c
Maximum amount of B present at any time is less than 50% of the initial amount of A.
d
The atomic numbers of A and C are the same.
answer is B.
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Detailed Solution
2 hours = 4 half lives, therefore, amount left = 6.25% of original.Loss of one α-particle and two β-particles does not change the atomic number.