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Chemistry · PYQ NEET UG 2024
हिन्दीGiven below are two statements: Statement I : The boiling point of hydrides of Group 16 elements follow the order \( \text{H}_2\text{O} > \text{H}_2\text{Te} > \text{H}_2\text{Se} > \text{H}_2\text{S} \). Statement II : On the basis of molecular mass, \( \text{H}_2\text{O} \) is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in \( \text{H}_2\text{O} \), it has higher boiling point. In the light of the above statements, choose the correct answer from the options given below:
Correct answer · Option 3
Both Statement I and Statement II are true.
Explanation
Due to extensive intermolecular hydrogen bonding, \( \text{H}_2\text{O} \) has an abnormally high boiling point compared to other hydrides of group 16 (\( \text{H}_2\text{S} < \text{H}_2\text{Se} < \text{H}_2\text{Te} < \text{H}_2\text{O} \)). Based purely on molar mass, \( \text{H}_2\text{O} \) would be expected to have the lowest boiling point, making both statements correct.
