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Q.

A radiator of motor vehicle was filled with 8.2L of water to which 2L of methanol (d=0.8gm/ml)  were added, the lowest temp. at which the vehicle can be parked without a danger of getting water in the radiator to freeze is (Kf for water = 1.86 Km–1)

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a

–5.6°C

b

–6.6°C

c

–4.3°C

d

–9.5°C

answer is A.

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Detailed Solution

ΔTf=Kf×WtGmt×1000Wt. of Sovlent =1.86×160032×10008200

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