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A 0.2 molal aqueous solution of weak aci...

A 0.2 molal aqueous solution of weak acid (HX) is 20% ionised. The freezing point of this solution is (Given, `K_(f) = 1.86^(@) C m^(-1)` for water)

A

`-0.31 ^(@)C`

B

`-0.45^(@)C `

C

`-0.53 ^(@) C`

D

`-0.90^(@) C`

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The correct Answer is:
B
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