Chemistry Exam > Chemistry Questions > Which of the following is false?a)Van der Waa...
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Which of the following is false?
- a)Van der Waals forces are responsible for the formation of molecular crystals.
- b)Boiling point of NH3 is greater than SbH3.
- c)In graphite, van der Waals forces act between the carbon layers.
- d)Branching lowers the boiling points of isomeric organic compounds due to reduction in the vander Waals force of attraction
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which of the following is false?a)Van der Waals forces are responsible...
False Statement:
Boiling point of NH3 is greater than SbH3.
Explanation:
Boiling point is defined as the temperature at which the vapor pressure of a liquid equals the external pressure. The strength of intermolecular forces present in a substance determines its boiling point.
NH3 and SbH3 both are hydrides, but they differ in their molecular structure and intermolecular forces. NH3 has a pyramidal structure with a lone pair of electrons on nitrogen, while SbH3 has a trigonal pyramidal structure with three hydrogen atoms and one lone pair of electrons on antimony.
NH3 has hydrogen bonding present between its molecules, which is a very strong intermolecular force. On the other hand, SbH3 has weak van der Waals forces of attraction between its molecules.
Therefore, NH3 has a higher boiling point than SbH3 due to the presence of strong hydrogen bonding between its molecules.
Hence, option B is the false statement.
Boiling point of NH3 is greater than SbH3.
Explanation:
Boiling point is defined as the temperature at which the vapor pressure of a liquid equals the external pressure. The strength of intermolecular forces present in a substance determines its boiling point.
NH3 and SbH3 both are hydrides, but they differ in their molecular structure and intermolecular forces. NH3 has a pyramidal structure with a lone pair of electrons on nitrogen, while SbH3 has a trigonal pyramidal structure with three hydrogen atoms and one lone pair of electrons on antimony.
NH3 has hydrogen bonding present between its molecules, which is a very strong intermolecular force. On the other hand, SbH3 has weak van der Waals forces of attraction between its molecules.
Therefore, NH3 has a higher boiling point than SbH3 due to the presence of strong hydrogen bonding between its molecules.
Hence, option B is the false statement.
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Community Answer
Which of the following is false?a)Van der Waals forces are responsible...
The boiling point of SbH3 is greater than NH3 due to its high molecular weight.
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Which of the following is false?a)Van der Waals forces are responsible for the formation of molecular crystals.b)Boiling point of NH3 is greater than SbH3.c)In graphite, van der Waals forces act between the carbon layers.d)Branching lowers the boiling points of isomeric organic compounds due to reduction in the vander Waals force of attractionCorrect answer is option 'B'. Can you explain this answer?
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