A radioactive element A decays by the se...

A radioactive element A decays by the sequuence with the half-lives given below :
`Aunderset(30min)overset(alpha)toBunderset(2 days)overset(2beta)toC`
Which of the following statements about this correct?

The mass number of B is greater than A

After two jhours, lesss than 10% of the initial A is left

maximum amount of B present at any time is less than 50% of the initial amount bof A

The atomic numbers of A and C are same

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The correct Answer is:

b,d

A and C are isotopes
After two houres A=`1/2""^(4)xx100`

A radioactive element X , decays by the sequence and with half-lives, given below, X underset(30"min")overset(alpha)(rarr) Y underset(2"days")overset(beta)(rarr) Which of the follwing statemetns about this system are correct?

After two hours, less than `10%` of the initail `X` si left.

Maximum amount of `Y` present at any time is less than `50%` of the initial amount of `X`

Atomic no.of `X` and `Z` are same.

Mass no. of `Y` is greater than `X`.

The mass number of `B` is greater then `A`.

After two hours, less than 10% of the initial `A` is left.

Maximum amount of `B` present at any time is less than 50% of the initial amount of `A`.

The atomic numbers of `A` and `C` are the same.

In the formation of (D) from (C ), ring expansion takes place.

The product (D) is cyclopentanone.

The product (D) is `alpha,beta`-unsaturated cyclopentanone

Conversion of (B) to (C ) can also be carried out with LAH.