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CBSE 12th Standard Chemistry Subject The p-Block Elements Ncert Exemplar Fill Ups Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

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Questions:

1 Marks

5 x 1 = 5

Complete the following : \(XeF_2+PF_5\rightarrow\)

Which compound led to the discovery of compounds of noble gases ?

Why do boiling points of noble gases increase from helium to radon?

Noble gases are monoatomic in nature. Explain.

Write two names of interhalogen compounds having sp³d² hybridization.

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Answers Key:

1 Marks

5 x 1 = 5

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Due to the presence of three lone pairs of electrons, XeF₂ acts as fluoride ion donor while due to the presence of vacant sp³ d orbitals, PF₅ acts as a fluoride ion acceptor. In other words, XeF₂ acts as a Lewis base while PF₅ acts as a Lewis acid to form the corresponding adduct.\(\underset{Lewis\ base}{XeF_2} + \underset{Lewis\ acid}{PF_5}\rightarrow\underset{Adduct} {[XeF]^+[PF_6]^-}\)

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The formation of \(O^+_2[PtF_6]^-\) during the reaction of PtF₆on O₂ led to the discovery of compounds of noble gases .

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As the size of the noble gas increases, van der Waals forces of attraction increase accordingly and hence the b.p.s, increase from He to Rn.

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All the orbitals (which are occupied by electrons) are completely filled in noble gases. Therefore, they have no tendency to share electrons with other atoms to form diatomic molecules and hence are monoatomic in nature.

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All interhalogen compounds of the typw XX'₅involve sp₃d₂ hybridization of the central halogen atom (X) and hence have oxtahedral (or square pyramidal) geometry with one position occupied by a pair of electrons.