The average molar mass of chlorine is $35.5 \mathrm{~g} \mathrm{~mol}^{-1}$. The ratio of ${ }^{35} \mathrm{Cl}$ to ${ }^{37} \mathrm{Cl}$ in naturally occrring chlorine is close to :
$4: 1$
$3: 1$
$2: 1$
$1: 1$
Correct Option: , 2
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