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Question

# The plots of 1XAvs.1YA (where, XA and YA are the mole fraction of liquid A in liquid and vapour phase respectively) is linear with slope and intercepts respectively

A
P0A/P0B and (P0AP0B)P0B
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B
P0A/P0B and (P0BP0A)P0B
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C
P0B/P0A and (P0AP0B)P0B
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D
P0B/P0A and (P0BP0A)P0B
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Solution

## The correct option is B P0A/P0B and (P0B−P0A)P0BThe plots of 1XAvs.1YA (where, XA and YA are the mole fraction of liquid A in liquid and vapour phase respectively) is linear with slope and intercepts equal to P0A/P0B and (P0B−P0A)P0B respectively.P′A=P0AXA and P′B=P0BXBP′A=PMYA and P′B=PMYB∴PAYA=PBYBorP0AXAYA=P0BXBYB=P0B(1−XA)(1−YA)orP0BXA=P0AYA+(P0B−P0A)or1XA=1YA⋅P0AP0B+(P0B−P0A)P0Bory=mx+C∴Slope=m=P0AP0B and intercept C=(P0B−P0A)P0B.

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