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Chlorine exists in two isotopic forms, C...

Chlorine exists in two isotopic forms, CI-37 and CI-35 but its atomic mass is 35.5. This indicates the ratio of CI-37 and CI-35 is approximately

A

`1 :2`

B

`1 : 1`

C

`1 : 3`

D

`3 :1`

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The correct Answer is:
C
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