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The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H 2 O > H 2 S > H 2 Se > H 2 Te > H 2 Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom.

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The p-Block Elements

Short Answer Type

761.

Give reasons for the following:
(i) (CH₃)3P = O exists but (CH₃)₃N = O does not.
(ii) Oxygen has less electron gain enthalpy with the negative sign than sulphur.
(iii) H₃PO₂ is a stronger reducing agent than H₃PO₃.

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762.

Complete the following reactions :
NH₃ + 3Cl₂(excess) →

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763.

Complete the following reactions :
XeF₆ + 2H₂O →

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764.

What happens when
H₃PO₃ is heated?

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765.

Draw the structures of the following :
H₂S₂O₇

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766.

Draw the structures of the following :
XeF₆

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767.
Give reasons:
Thermal stability decreases from H₂O to H₂Te.

The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H₂O > H₂S > H₂Se > H₂Te > H₂Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom.

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