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Anomalous Behaviour of Boron - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main
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38 Questions around this concept.
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Which of these statements is not true ?
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 :
Boric acid is solid, whereas is gas at room temperature because of
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Given below are two statements:
Statement I: Boron is extremely hard indicating its high lattice energy.
Statement II: Boron has the highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below.
The incorrect statement from the following for borazine is:
What will be the distance in
molecule if you are given with
distance as
in
molecule?
$\mathrm{BCl}_3$ can act as
Which of the following complex doesn't exist?
Boron has more tendency to form complex than Lithium or any alkali metal. It is due to
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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.
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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