1.

Which of the following are pairs of isotopes [Bihar CEE 1982]

A.                 \[_{1}^{2}{{H}^{+}}\] and \[_{1}^{3}H\]                
B.                 \[_{1}^{3}H\]  and \[_{2}^{4}{{H}^{-}}\]
C.                 \[_{2}^{3}He\] and \[_{2}^{4}He\]          
D.                 \[_{6}^{12}C\] and \[_{7}^{14}{{N}^{+}}\]
Answer» B.                 \[_{1}^{3}H\]  and \[_{2}^{4}{{H}^{-}}\]


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