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JEE Main levelSingle correct optionDifficulty 2 of 3pb025

Which statement about the forms of alumina is correct?

Aboth forms dissolve readily in dilute acids
B $α$ - $Al X_{2} O X_{3}$ (corundum) is very hard and inert to acids, while $γ$ - $Al X_{2} O X_{3}$ dissolves in acids
C $γ$ - $Al X_{2} O X_{3}$ is the hard form used as an abrasive
D $α$ - $Al X_{2} O X_{3}$ is soluble in water to give an acidic solution

Answer: B

α

-Alumina (corundum) is a hard, compact, chemically inert form used as abrasive and gemstone base.

γ

-Alumina, obtained by heating the hydroxide at a lower temperature, is porous, dissolves in acids and is used in chromatography.

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