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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.

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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?

NO has odd number of electrons (7 + 8 = 15) and due to the presence of unpaired electron, it is paramagnetic in the gaseous state.

However, in the liquid and solid states, the unpaired electrons are involved in the formation of loose dimer. In the absence of any unpaired electrons, it is diamagnetic in nature.

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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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