1.

Atomic weight of boron is 10.81 and it has two isotopes \[_{5}{{B}^{10}}\]and \[_{5}{{B}^{11}}\]. Then ratio of \[_{5}{{B}^{10}}{{:}_{5}}{{B}^{11}}\]in nature would be                  [CBSE PMT 1998; JIPMER 2001, 02]

A.            19 : 81                                     
B.            10 : 11
C.            15 : 16                                     
D.            81 : 19
Answer» B.            10 : 11


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