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The p-Block Elements

Short Answer Type

681. How is XeO₃, prepared? Write the related chemical equations. Draw the structure of XeO₃.

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682.

Explain why phosphorus forms PF₅ while nitrogen does not form NF₅.

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683.

Accounts for the following:
NH₃ is stronger base than PH_3.

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684.

Accounts for the following:
HF is weaker acid than HI

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685.

Are all the five bonds in PCl₅,molecule equivalent? Justify your answer.

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686. Explain why ClF₃ exists whereas FCl₃ does not.

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687.

How would your prepare the following: (i) H₃PO₃, (ii) HI, (iii) HClO₄.

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688.

How are XeF₂, and XeF₄ prepared?

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689.

Draw the structures of the followings: (a) H₂SO₃, (b) H₂SO₄, (c) SO₃.

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690.
Account for the following:
The boiling points of noble gases increase with the increase in atomic number.

The melting and boiling points of noble gases are very low in comparison to those of other substances of comparable atomic and molecular masses. This indicates that only weak van der Waals forces or weak London dispersion forces are present between the atoms of the noble gases in the liquid or the solid state.

The van der Waals force increases with the increase in the size of the atom, and therefore, in general, the boiling point increase from He to Rn.

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