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1 g of arsenic dissolved in 86 g of benz...

1 g of arsenic dissolved in 86 g of benzene brings down the freezing point to `5.31^@C` from `5.50^@C`.If `K_f` of benzene is `4.9 (.^(@)C)/m`, the atomicity of the molecule is : (As =75 or As GAM 75)

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The correct Answer is:
4
`DeltaT_f=K_fm`
`0.19=4.9xx((1/M)/86)/1000implies0.19=4.9xx1000/(Mxx86)implies M=(4.9xx1000)/(86xx0.19)=300`
Atomicity=`300/75=4`
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