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a
Boron is fairly rare element
b
In nature, it occurs in all of orthoboric acid, borax and kernite
c
B10 and B11 exist in 19% and 81% abundance in nature
d
All of the above are correct
answer is D.
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Detailed Solution
Boron is fairly rare element ,in nature it exist in combined state i.e Orthoboric acid ,Borax and Kernite .Isotopes of Boron B10 and B11 exist in 19% and 81% abundance in nature.