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Statement-1 : Boron has relative atomic ...

Statement-1 : Boron has relative atomic mass 10.81.
Statement-2 : Boron has two isotopes `._5^10B` and `._5^11B` and their relative abundance is `19%` and `81%`.

A

Statement-1 : is True, Statement-2 : is True, Statement-2 : is a correct explanation for Statement-1 :

B

Statement-1 : is True, Statement-2 : is True, Statement-2 : is NOT a correct explanation for Statement-1 .

C

Statement-1 : is Ture, Statement-2 : is False.

D

Statement-1 : is False, Statement-2 : is True.

Text Solution

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The correct Answer is:
A
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Assertion : Relative atomic mass of boron is 10.8 Reason : Boron has two isotopes B-10 and B-11 with percentage abundance of 19.6 % and 80.4 % respectively.

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions Assertion (A) - Relative atomic mass of boron is 10.8 Reason (R) - Boron has two isotopes B-10 and B-11 with percentage abundance of 19.6% and 80.4% respectively.

The natural boron of atomic weight 10.81 is found to have two isotopes .^10B and .^11B .The ratio of abundance of isotopes of natural boron should be

Atomic weight of boron is 10.81 and it has two isotopes ._5 B^10 and ._5 B^11 . Then ratio of ._5 B^10 in nature would be.

(a) Two stable isotope of ._3Li^6 and ._3Li^7 have respective abundances of 7.5% and 92.5% . These isotopes have masses 6.01512 and 7.01600 u respectively. Find the atomic weight of lithium. (b) Boron has two stable isotopes ._5B^(10) and ._5B^(11) . Their respective masses are 10.01294 u and 11.00931u, and the atomic weight of boron is 10.81u. Find the abundaces of ._5B^(10) and ._5B^(11) .

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