Anomalous behaviour of boron, Chemistry

Assignment Help:

Just like lithium and beryllium in Groups Land 2, boron also shows anomalous behaviour. In general, the boron chemistry resembles that of silicon (occupying a diagonal position in the periodic table) more closely than that of Al, Ga, In and TI. This is because of the small size and high electronegativity of boron as compared to those of Al, Ga, In and TI. Boron resembles silicon and differs from Al, Ga, In and TI in the following manner:

  • Both B and Si are non metals whereas Al, Ga, In and TI are distinctly metallic in nature.
  • B(OH)3 and Si(OH)4 are acidic in nature, AI(OH)3, and Ga(OH)3, are amphoteric and In(OH)3, and Tl(OH)3, basic in nature.
  • The hydrides of B and Si are volatile, spontaneously inflammable liquids. These are readily hydrolysed by water and acids whereas aluminium hydride is a non volatile polymeric solid. Hydrides of Ga, In and Tl are not stable.
  • BCl3 and SiCI4, are monomeric covalent compounds which are readily hydrolysed by water to B(OH)3, and Si(OH)4. Anhydrous AlCl3, is also a covalent compound and exists in the form of a dimer, i.e. Al2Cl6,. On dissolving in water, it readily gives Al3+(aq) and Cl-(aq) whereas B3+(aq) does not exist.
  • Both B203 and Si02 are acidic in nature and react with metallic oxides on fusion to form borate and silicate glasses. On the other hand, Al203 is amphoteric.
  • Boron reacts with more electropositive elements, i.e. metals to form borides which are very hard substances; Al, Ga, In and TI form alloys with metals.

Related Discussions:- Anomalous behaviour of boron

Illustrate diffrent types of graphs, Q. Illustrate diffrent types of graphs...

Q. Illustrate diffrent types of graphs? Circle graphs a circle graph is utilized to show the parts of a fixed whole. This kind of graph is occasionally called a pie chart bec

POTENTIOMETRIC TITRATION, WHAT TYPE OF CHEMICAL REACTION IS INVOLVED IN POT...

WHAT TYPE OF CHEMICAL REACTION IS INVOLVED IN POTENTIOMETRIC TITRATION

Solvent effect of UV, what is the solvent effect on transition metal?

what is the solvent effect on transition metal?

Physical properties of acetone - aldehydes and ketones, Physical properties...

Physical properties of Acetone - Aldehydes and Ketones (a)  Acetone is a colourless liquid with characteristic pleasant odour. (b) Acetone is inflammable liquid. It boils at

Purification and characterisation of acetone , What is this characterisatio...

What is this characterisation all about?and how do you do it using DNPH?

Separation, examples of masking agents and substance used for

examples of masking agents and substance used for

How will you convert 4-nitrotoulene to 2-bromonezoic acid?, 4-nitrotolouene...

4-nitrotolouene ---> LiAlH 4 converts it to 4-aminotoluene ----> Add HNO 2 and it forms -----> diazonium salt ------> add H 3 PO 2 to get Toluene -----> add Br 2 /CCl 4 - 2

Hydrogen and its compounds, A sample of water contains: suspended matter = ...

A sample of water contains: suspended matter = 100 mg; Ca(NO3)2 = 16.4 mg/L; MgSO4 = 24 mg/L; MgCl2 = 19 mg/L; NaOH = 40 mg/L and KOH = 56 mg/L. Calculate temporary, permanent and

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd