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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

Verified by Experts

The correct Answer is:
A
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Atomic weight of boron is 10.81 and it has two isotopes ""_(5)B^(10) and ""_(5)B^(11) in nature would be :

Knowledge Check

  • 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.

    A
    If both assertion and reason are correct and reason is correct explanation for assertion
    B
    If both assertion and reason are correct but reason is not correct explanation for assertion
    C
    If assertion is correct but reason is incorrect
    D
    If both assertion and reason are incorrect

  • At 300 K and 1 atm, 15mL of a gaseous hydrocarbon requires 375mL air containing 20% O_(2) by volume for complete combustion. After combination the gases occupy 330 mL. Assuming that the water formed isin liquid form and the volumes were measured at the Atomic mass of boron is 10.81. it has two isotopes namely ._(5)^(11)B and ._(5)^(x)B with their relative abundance of 80% and 20% respectively. the value of x is:

    A
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    B
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    C
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    D
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  • 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.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true but R is not a correct explanation of A
    C
    A is true but R is false
    D
    A is false but R is true

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    The atomic mass of natural boron is 10.811. It consists of two isotopes with masses of 10.013 and 11.009. Find their fractions.

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