1.

Pickoutthe isotopesamongthefollowingpairs

Answer»

`""_(6) C^(13), ""_(7)N^(14)`
`""_(18) Ar^(40), ""_(20)Ca^(40)`
`""_(6) C^(12), C_(6)^(14)`
`""_(5) B^(12), ""_(6)C^(13)`

Answer :C


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