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B
3 : 1
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C
1 : 1
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D
1 : 4
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Solution
The correct option is A 3 : 1 The isotopes of Chlorine are Cl3517 and Cl3717 where Cl3717 is radioactive whereas Cl3517 is most abundant. So according to given options 3:1 is apt because Cl3517 abundance is more.