Statement I: When methanol is added to water boiling point of water decreases.
Statement II: Methanol when added to water gives a non ideal solution with negative deviation.

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Statement I and Statement II are true.

Statement I is false and Statement II is true.

Statement I is true and statement II is false.

Statement I and Statement II are false.

answer is B.

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Detailed Solution

CH₃OH-CH₃OH ....... Inter molecular H-bonding

H₂O-H₂O ....... Inter molecular H-bonding

H₂O-CH₃OH ....... Inter molecular H-bonding

Inter molecular H-bonding between CH₃OH - H₂O

is weaker than in CH₃OH-CH₃OH and H₂O-H₂O

$\large \therefore$ VP of CH₃OH - H₂O is higher than expected

This Azeotropic mix. shows positive deviation from Raoult's law

$\because$ VP is higher than expected its BP will be lesser than expected

BP of CH₃OH - H₂O is lesser than that of any one of its components.

It is a minimum boiling azeotrope

CH₃OH - H₂O mix. --- VP,higher than expected from Raoult's law ---- positive deviation

(II) is false

---- BP lesser than that of pure CH₃OH & H₂O ----- minimum boiling azeotrope

(I) is true

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