NEET 2024 — Chemistry solution

NEET2024Chemistry

Given below are two statements:

Statement I: The boiling point of hydrides of Group 16 elements follow the order H $_{2}$ O $>$ H $_{2}$ Te $>$ H $_{2}$ Se $>$ H $_{2}$ S.

Statement II: On the basis of molecular mass, H $_{2}$ 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 H $_{2}$ O, it has higher boiling point.

In the light of the above statements, choose the correct answer from the options given below:

A
Statement I is true, but Statement II is false.
B
Statement I is false, but Statement II is true.
C
Both Statement I and Statement II are true.
D
Both Statement I and Statement II are false.

Solution

The boiling-point trend for Group 16 hydrides is anomalous: H $_{2}$ O is highest due to strong H-bonding; below H $_{2}$ O the order goes H $_{2}$ S $<$ H $_{2}$ Se $<$ H $_{2}$ Te (rising with mass). Hence overall H $_{2}$ O $>$ H $_{2}$ Te $>$ H $_{2}$ Se $>$ H $_{2}$ S. Both statements are correct.

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