You must have heard about Corundum!

Chemistry Level 2

On heating $Al(OH)_{3}$ at $450^{o}C$ we get $Al_{2}O_{3}$ .

Based on the $Al_{2}O_{3}$ we obtained from the above reaction, check which of the following statement(s) is/are correct for it.

It is unaffected by mineral acids.
It is a very stable compound and it is unaffected by strong heating(even upto $\boxed{1500}^{o}C$ ).
It absorbs moisture and is used as a desiccant.
It is used in chromatography due to its adsorbing qualities.
It is extremely hard and is used as "jewellers rouge" to polish glass.
It is highly porous in nature.

$Note :$

Input your answer in this form :

For example, if statements 2,4,5 are correct, then enter = $2 \times 4 \times 5$ = $\boxed{40}$

1 solution

Richeek Das
Apr 14, 2019

The compound formed in the above reaction is $\gamma -$ $Al_{2}O_{3}$ .

Its a white porous compound, which dissolves in acids, absorbs moisture and is used in chromatography.
Upon strong heating it changes to a stable and extremely hard form known as Corundum(i.e - $\alpha-Al_{2}O_{3}$ )