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The p-Block Elements

Short Answer Type

571. Assign reason for each of the following:
Noble gases are mostly chemically inert.

Genral electronic configuration of noble gas is ns² np⁶. Thus having stable coniguration.
Noble gases are mostly chemically inert due to the following reasons:
(i) Atoms of the noble gases have stable closed shell electronic configuration.
(ii) Noble gases have exceptionally high ionisation energies.
(iii) Noble gases have very low electron affinities.

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572. Assign reason for the following:
Bismuth is a strong oxidizing agent in a pentavalent state.

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573. NO is paramagnetic in the gaseous state but diamagnetic in the solid and liquid states. Justify?

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574. (CH₃)₃ N is basic but (CF₃)₃ N is not basic. Explain.

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575. Why the melting and boiling points of halogens increases in going from top to the bottom of the group?

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576. Give appropriate reason for the following observation:
Only higher members of Group 18 of the periodic table are expected to form compounds.

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577. Give appropriate reason for the following observation:
Fluorine is a stronger oxidising agent than chlorine, though fluorine has lower electron affinity than chlorine.

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578. Give appropriate reason for the following observation:
NO₂ readily forms a dimer, whereas ClO₂ does not.

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579.

Account for the following:
Chlorine water has both oxidizing and bleaching properties.

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580.

Account for the following:
H₃PO₂ and H₃PO₃ acts as good reducing agents while H₃PO₄ does not.

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

571. Assign reason for each of the following:Noble gases are mostly chemically inert.

571. Assign reason for each of the following:
Noble gases are mostly chemically inert.