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The p-Block Elements

Short Answer Type

661. What type of hybridisation explains the trigonal bipyramidal shape of SF₄?

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662. What is the state of hybridization of N in NO_3^-?

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663. Write the structure of pyrophospheric acid.

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664. Name the geometry of XeF₄ and XeO₃.

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665. Why is N₂ not particularly reactive?

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666. Give an example of oxoacid of phosphorus in which oxidation state of phosphorus is + 4.

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667. Name the noble gas which has (i) highest first ionization energy (ii) highest boiling point.

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668. Why does sulphur in vapour state exhibit paramagnetic character?

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669. Arrange the hydrides of group 16 in the decreasing order of their thermal stability. Is the order same or different for their reducing character?

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670. Arrange the hydrides of group 16 in the decreasing order of their thermal stability. Is the order same or different for their reducing character?

The stability of hydrides decreases moving down the group this is because of the decrease in the bond dissociation enthalpy of hydrides on moving down the group.

H₂O>H₂S>H₂Se>H₂Te>H₂Po

Reducing Character:
All hydrides of group 16 elements, except H₂O, are reducing agent.
The reducing power of these hydrides increase in going form H₂S to H₂Te, which may be due to increase in the size of the atom and hence decrease in the M-H bond energy.

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