A very diluted saturated solution of a sparingly soluble salt `X_(3)Y_(4)` has a vapour pressure of 20 mm Hg temperature T, while pure water exerts a pressure of 20.0126 mm Hg at the same temperature . Calculate molality (m)at temperature T :
A
`6.3xx10^(-4)`
B
`3.5xx10^(-2)`
C
`5xx10^(-3)`
D
None of these
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The correct Answer is:
c
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