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  4. Anomalous Behaviour of Boron MCQ - Practice Questions with Answers

Anomalous Behaviour of Boron MCQ - Practice Questions with Answers

Updated on Sep 25, 2023 25:24 PM

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  • 31 Questions around this concept.

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Which one of the following elements is unable to form \mathrm{MF_6^{3-}} ion?

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 Which of these statements is not true ?

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Which of the following structure is similar to graphite?

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Which of the following is least likely to behave as Lewis base?

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Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :

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Concepts Covered - 1

Anomalous Behaviour of Boron

Certain important trends can be observed in the chemical behaviour of group 13 elements. The tri-chlorides, bromides and iodides of all these elements being covalent in nature are hydrolysed in water. Species like tetrahedral [M(OH)4]- and octahedral [M(H2O)6]3+, except in boron, exist in an aqueous medium.
The monomeric trihalides, being electron-deficient, are strong Lewis acids. Boron trifluoride easily reacts with Lewis bases such as NH3 to complete octet around boron.

\mathrm{F}_{3} \mathrm{B}+: \mathrm{NH}_{3} \rightarrow \mathrm{F}_{3} \mathrm{B} \leftarrow \mathrm{NH}_{3}

It is due to the absence of d orbitals that the maximum covalence of B is 4. Since the d orbitals are available with Al and other elements, the maximum covalence can be expected beyond 4. Most of the other metal halides (e.g., AlCl3) are dimerised through halogen bridging (e.g., Al2Cl6). The metal species completes its octet by accepting electrons from halogen in these halogen bridged molecules.

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Anomalous Behaviour of Boron

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Anomalous Behaviour of Boron Current Topic

Physical Properties of Boron Family
Anomalous Behaviour of Boron
Diagonal Relationship of B and Si
Chemical Properties of Boron Family
Diborane
Orthoboric Acid
Borax Formula
Group 14 Elements (Carbon Family)
Allotropes of Carbon
Carbon monoxide and carbon dioxide

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Anomalous Behaviour of Boron

Chemistry Part II Textbook for Class XI

Page No. : 320

Line : 18

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