Which one of the following is incorrect?
- Boron halides are all monomeric while those of Al are dimeric.
- Boron halides and aluminium halides exist as monomeric halides.
- Boron halides and aluminium halides are Lewis acids.
- $B_2O_3$ alone is acidic while $Al_2O_3$ is amphoteric.
The Correct Option is B
Solution and Explanation
Since the boron atom is not surrounded by an octet of electrons, boron halides like BF3 or BCl3 are electron-deficient compounds. They thus have a propensity to operate as potent Lewis acids by taking electrons from several Lewis bases to produce persistent acid-base adducts, serving as catalysts for numerous significant chemical processes.
The bond angle of boron halides, which have a planar structure and a sp2 hybridization, is 120°. The experimentally discovered BX bond lengths, however, are shorter than the values predicted from the halogens' and boron's covalent single bond radii.
In addition to the Lewis acid-base reaction and the most common compounds featuring covalent bonds between a non-metal and a halogen, boron halides are subject to a variety of other reactions. Through hydrolysis processes, these substances react vehemently with water to produce boric acid and hydrogen halide. The broad response below can serve as a representation of this.
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Given below are two statements.
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Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
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Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. $(\mathrm{B}<\mathrm{Al}),(\mathrm{Al}<\mathrm{Ga}),(\mathrm{Ga}<\mathrm{In})$ and $(\mathrm{In}<\mathrm{Tl})$ Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius $\left(\mathrm{M}^{3+}\right)$ than the other one. The atomic number of the element (X) is
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B. The reducing ability of the hydrides increases in the order \(\text{NH}_3 < \text{PH}_3 < \text{AsH}_3 < \text{SbH}_3 < \text{BiH}_3\)
C. Among the hydrides, \(\text{NH}_3\) is a strong reducing agent while \(\text{BiH}_3\) is a mild reducing agent.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family