Which pair of substances given below are isotopes?

1.	Which pair of substances given below are isotopes?
A.	\[_{6}^{12}C\]and\[_{6}^{14}C\]
B.	Carbon dioxide and carbon monoxide
C.	Diamond and graphite
D.	\[{{C}_{2}}{{H}_{4}}\]and\[{{C}_{3}}{{H}_{6}}\]
Answer» B. Carbon dioxide and carbon monoxide

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Which pair of substances given below are isotopes?

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