1.

Which of the following pairs is an isobar           [MP PET 1994]

A.            \[_{1}{{H}^{1}}\]and \[_{1}{{H}^{2}}\]                          
B.            \[_{1}{{H}^{2}}\]and \[_{1}{{H}^{3}}\]
C.            \[_{6}{{C}^{12}}\]and \[_{6}{{C}^{13}}\]                      
D.            \[_{15}{{P}^{30}}\]and \[_{14}S{{i}^{30}}\]
Answer» E.


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