Atomic weight of boron is 10.81 and it h...

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.

`19 : 81`

`10 : 11`

`15 : 16`

`81 : 19`

Text Solution

Verified by Experts

The correct Answer is:

Let ratio `._(5)B^(10):._(5)B^(11) = 1:x`
`10.81 = (1xx10+ x xx11)/(1+x)`
`10.81 +10.81x = 10+11x`
`0.19x = 0.81`
`x = (81)/(19)`

Topper's Solved these Questions

NUCLEAR PHYSICS AND RADIO ACTIVITY
CP SINGH|Exercise EXERCISES|118 Videos
NEET PREVIOUS YEAR
CP SINGH|Exercise PAPER|89 Videos
OPTICAL INSTRUMENTS
CP SINGH|Exercise EXERCISES|63 Videos

Similar Questions

Explore conceptually related problems

B-10 isotopes

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

(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) .

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.

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% .

CP SINGH-NUCLEAR PHYSICS AND RADIO ACTIVITY-EXERCISES

Two nuclei have their mass numbers in the ratio of 1:3. The ratio of t...
Text Solution
|
The graph of 1n (R/R0) versus 1n A (R = radius of a nucleus and A = it...
Text Solution
|
Atomic weight of boron is 10.81 and it has two isotopes .5 B^10 and .5...
Text Solution
|
An element A decays into element C by a two-step process : A rarr B ...
Text Solution
|
Which of the following is correct regarding nucleus forces?
Text Solution
|
Two protons are kept at a separation of 10 nm. Let Fn and Fe be the nu...
Text Solution
|
Two nucleons are at a separation of 1 xx 10^-15 m. The net force betwe...
Text Solution
|
Size of nucleus is of the order of
Text Solution
|
Which of the following is correct regarding binding enegry of nucleus?
Text Solution
|
Mass defect of an atom refers to
Text Solution
|
Mp denotes the mass of a proton and Mn that of a neutron. A given nucl...
Text Solution
|
A nucleus .Z^A X has mass represented by M(A, Z). If Mp and Mp denote ...
Text Solution
|
The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. r...
Text Solution
|
If M is the mass of a nucleus and A is its mass number, then (M -A)/(M...
Text Solution
|
As the mass number A increases, the binding energy per nucleon in a nu...
Text Solution
|
For atomic nuclei, the binding energy per nucleon
Text Solution
|
Which of the following is a wrong description of binding energy of a n...
Text Solution
|
If the total binding energies of .(1)H^(2),.(2)He^(4),.(26)Fe^(56) and...
Text Solution
|
If the binding energy per nucleon in L i^7 and He^4 nuclei are respect...
Text Solution
|
Average binding energy per nucleon over a wide range is
Text Solution
|