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A certain substance A tetramerizes in wa...

A certain substance `A` tetramerizes in water to the extent of `80%`. A solution of `2.5 g` of `A` in `100 g` of water lowers the freezing point by `0.3^(@)C`. The molar mass of `A` is
a.`120` , b.`61` ,c.`60` ,d.`62`

A

122

B

31

C

244

D

62

Text Solution

Verified by Experts

The correct Answer is:
D
`alpha=(1-i)/(1-(1)/(n))`
`0.8=(1-i)/(1-(1)/(4)),i=0.4`
`DeltaT=iK_(f)xxm`
`0.3=0.4xx1.86xx(w_(B)xx1000)/(m_(B)xxw_(A))`
`0.3=0.4xx1.86xx(2.5xx1000)/(m_(B)xx100)~
`m_(B)=62`]
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