The measured freezing point depression f...

The measured freezing point depression for a 0.1 m aqueous `CH_3COOH` soluton is `0.19^@C`. The acid dissociation constant `K_a` at this concentration will be (Give `K_f`, the molal cryoscopic constant=`1.86 K kg mol^-1`)

`4.76xx10^-5`

`4xx10^-5`

`8xx10^-5`

`2xx10^-5`

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