Would you expect the hydrides of $N, O$ and $F$ to have lower boiling points than the hydrides of their subsequent group members ? Give reasons.

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Solution

On the basis of molecular masses of $N H_{3}, H_{2} O$ and $H F,$ their boiling points are expected to be lower than those of the subsequent group member hydrides.

However, due to higher electronegativity of $N, O$ and $F,$ the magnitude of hydrogen bonding in their hydrides will be quite appreciable. Hence, the boiling points $N H_{3}, H_{2} O$ and $H F$ will be higher than the hydrides of their subsequent group members.

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Q. Assertion :Hydrides of

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and

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Atomic Size and Electronegativity

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Would you expect the hydrides of N,O and F to have lower boiling points than the hydrides of their subsequent group members ? Give reasons.

Would you expect the hydrides of $N, O$ and $F$ to have lower boiling points than the hydrides of their subsequent group members ? Give reasons.