Q.

On adding I g arsenic to 80 g benzene, the freezing point of benzene is lowered by 0.19oC. The formula of arsenic is Kf=50.8 K kg mol-1).

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a

As

b

As2

c

As3

d

As4

answer is D.

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Detailed Solution

ΔTf=1000KfwmWΔTf=0.19∘C;Kf=5.08Kkgmol−1,w=1g;W=80g    m=1000KfwΔTfW=1000×5.08×10.19×80=334.21Atomic weight of As - 74.92Hence, member of atoms =334.2174.92≈4Hence, the formula of arsenic is As4.
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On adding I g arsenic to 80 g benzene, the freezing point of benzene is lowered by 0.19oC. The formula of arsenic is Kf=50.8 K kg mol-1).