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MDCAT
Chemistry
2011

Chemistry · Chemical Bonding

Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.

Question

Melting point of water is higher than petrol, because intermolecular forces in water are:

Options
  • A

    Weaker than petrol

  • B

    Stronger than petrol

  • C

    Same as in petrol

  • D

    Negligible

Explanation

Melting and boiling points depend on the intermolecular strengths of a molecule, higher the boiling and melting point stronger the intermolecular forces. Hence melting point of water is higher than petrol because water has stronger intermolecular forces than petrol.

Incorrect: Water has stronger hydrogen bonding, while petrol has weaker dispersion forces. 

Melting and boiling points depend on the intermolecular strengths of a molecule, higher the boiling and melting point stronger the intermolecular forces. Hence melting point of water is higher than petrol because water has stronger intermolecular forces than petrol. 

Incorrect: Intermolecular forces differ due to hydrogen bonding in water and dispersion forces in petrol. 

Incorrect: Both substances have significant intermolecular forces affecting their melting points. 

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Tagged under Chemistry · Chemical Bonding · 2011