Show the properties of aluminium oxide, Chemistry

Assignment Help:

Q. Show the properties of Aluminium Oxide ?

Aluminium oxide, Al203 is a highly ionic compound of aluminium. It is also known as alumina. As you have studied earlier, it occurs in nature not only as bauxite and colourless corundum, but also as coloured gem stones like ruby, emerald, sapphire and topaz, etc. Colours of these gem stones are due to the presence of transition metal ions. Anhydrous aluminium oxide can exist in two forms both of which are white. These are a-Al203 and 7-AI2O3. The 7-AI2O3 is formed by dehydrating AI (OH) 3 below 750 K:

2AI (OH)3--------------------------------------> 7-Al2O3 + 3H20

The 7-Al203 is quite reactive. It dissolves readily in both acids and bases. If the 7-AI2O3 is heated to 1500 K, it changes to the a-AI2O3, which is called corundum. Corundum has a very high melting point (about 2328 K). It is very hard and inert,-especially towards acids.


Related Discussions:- Show the properties of aluminium oxide

Brief meaning of water of crystallization , In crystallography, water of cr...

In crystallography, water of crystallization or water of hydration or crystallization water is water that occurs in crystals. Water of crystallization is essential for the maintena

Show the properties of diborane, Q. Show the Properties of diborane? Di...

Q. Show the Properties of diborane? Diborane is a colourless gas (b. p., 183K). It is rapidly decomposed by water with the formation of H 3 B0 3 and H 2 : B 2 H, + 6H 2 0 -

No molecule acts as a passitive and negative ligand. why?, Molecule in itse...

Molecule in itself is electrically stable so it cant act as ligand So that it can acts as the negative and pasitive ligand.

What do you understand by the term public health, Question : (a) (i) ...

Question : (a) (i) What do you understand by the term "Public Health"? (ii) What are the three core functions of public health? (iii) How does a public health system

Negative deviation or positive deviation, Refer to diagram A, which describ...

Refer to diagram A, which describes the system formed by water-ethanol mixtures at 1 atm pressure, but is not drawn to scale.  Industrial ethanol production results in the lowest-b

What is geometrical isomers, Q. What is Geometrical isomers? Let us tak...

Q. What is Geometrical isomers? Let us take one final example of Ma 2 b 2 cd where the following five isomers are possible as shown in Fig. 'When writing the geometrica

Non-benzenoid aromatics and heterocyclic compounds, Non-benzenoid aromatics...

Non-benzenoid aromatics and Heterocyclic compounds There are aromatic compounds that have structural units which are not same from benzenoid type and are termed as Non-benzeno

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