Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is
35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately
(i) 1:2
(ii) 1:1
(iii) 1:3
(iv) 3:1
Option (iii) 1:3 is the answer.
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