1.

Which of the following is an isobaric pair               [CPMT 1987, 93]

A.                 \[_{6}{{C}^{13}},{{\,}_{7}}{{N}^{13}}\]   
B.                 \[_{6}{{C}^{13}},{{\,}_{7}}{{N}^{14}}\]
C.                 \[_{7}{{N}^{14}},{{\,}_{8}}{{O}^{15}}\]  
D.                 \[_{7}{{N}^{13}},{{\,}_{8}}{{O}^{15}}\]
Answer» B.                 \[_{6}{{C}^{13}},{{\,}_{7}}{{N}^{14}}\]


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