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Q.

Atomic mass of boron is 10.81. It has two Isotopes namely $5^{B^{11}}$ and $5^{B^{x}}$ with their relative abundance of 80% and 20% respectively. The value of x is

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a

10.01

b

10

c

10.02

d

10.05

answer is A.

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Detailed Solution

${(a + w ƒ)}_{a v} = \sum x i M i$

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