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The p-Block Elements

Short Answer Type

81.

What happens when:
Hydrated alumina is treated with aqueous NaOH solution?

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82.

Write reactions to justify amphoteric nature of aluminium.

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Long Answer Type

83.
How does aluminium react with:
(i) boiling water.
(ii) concentrated H₂SO₄(iii) dilute nitric acid
(iv) concentrated HCl
(v) NaOH?

(i) Action with boiling water. It decomposes boiling water to liberate hydrogen.

(ii) Action with concentrated H₂SO₄. It reacts with hot concentrated sulphuric acid to liberate sulphur dioxide.

(iii) Action with dilute nitric acid. Aluminium reacts with dilute nitric acid to form aluminium nitrate and ammonium nitrate.


(iv) Action with concentrated HCl. Aluminium dissolves in moderately concentrated hydrochloric acid to form (hydrated) chloride.


(v) Action with NaOH. It dissolves in hot sodium hydroxide solution to form sodium meta-aluminate.