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Chlorine exists in two isotopic forms Cl...

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

A

`1:2`

B

`1:1`

C

`1:3`

D

`3:1`

Text Solution

Verified by Experts

The correct Answer is:
C
The fractional atomic mass (35.5) of chlorine is due to the fact that in ordinary chlorine atom, `Cl-37` and Cl-35 are present in the ratio of 1 : 3.
`therefore` Average atomic mass of
`Cl=(3xx35+1xx37)/4=35.5` amu.
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