NEET Exam > NEET Questions > If the boiling point of H2O is 373 K, the bo...
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If the boiling point of H2O is 373 K, the boiling point of H2S will be :
- a)less than 300 K
- b)equal to 373 K
- c)more than 373 K
- d)greater than 300 K but less than 373 K
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If the boiling point of H2O is 373 K, the boiling point of H2S will b...
Explanation:
Boiling point refers to the temperature at which the vapor pressure of a liquid becomes equal to the atmospheric pressure. The boiling point of a substance depends on the strength of intermolecular forces between its molecules.
Intermolecular forces in H2O and H2S:
- H2O has hydrogen bonds between its molecules, which are strong dipole-dipole forces.
- H2S has weaker London dispersion forces between its molecules due to its larger size and lower electronegativity.
Effect of intermolecular forces on boiling point:
- Stronger intermolecular forces lead to higher boiling points as more energy is required to break the bonds between the molecules.
- Weaker intermolecular forces lead to lower boiling points as less energy is required to break the bonds between the molecules.
Comparison of boiling points of H2O and H2S:
- H2O has a boiling point of 373 K due to its strong hydrogen bonds.
- H2S has weaker London dispersion forces compared to hydrogen bonds, so its boiling point will be lower than that of H2O.
- Therefore, the boiling point of H2S will be less than 300 K.
Conclusion:
Hence, option A is the correct answer as the boiling point of H2S will be less than 300 K.
Boiling point refers to the temperature at which the vapor pressure of a liquid becomes equal to the atmospheric pressure. The boiling point of a substance depends on the strength of intermolecular forces between its molecules.
Intermolecular forces in H2O and H2S:
- H2O has hydrogen bonds between its molecules, which are strong dipole-dipole forces.
- H2S has weaker London dispersion forces between its molecules due to its larger size and lower electronegativity.
Effect of intermolecular forces on boiling point:
- Stronger intermolecular forces lead to higher boiling points as more energy is required to break the bonds between the molecules.
- Weaker intermolecular forces lead to lower boiling points as less energy is required to break the bonds between the molecules.
Comparison of boiling points of H2O and H2S:
- H2O has a boiling point of 373 K due to its strong hydrogen bonds.
- H2S has weaker London dispersion forces compared to hydrogen bonds, so its boiling point will be lower than that of H2O.
- Therefore, the boiling point of H2S will be less than 300 K.
Conclusion:
Hence, option A is the correct answer as the boiling point of H2S will be less than 300 K.
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Community Answer
If the boiling point of H2O is 373 K, the boiling point of H2S will b...
At room temperature, water is liquid and has boiling point 373 K due to hydrogen bonding. Whereas H2S is a gas and it has no hydrogen bonding. Hence the boiling point of H2S is less than 300 K (boiling point of H2S is -60°C).
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