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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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83.

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

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84.

Show by the reactions that aluminium has a strong affinity for oxygen.

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85.

Why does aluminium become passive when dipped in concentrated nitric acid?

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86.

Give reasons:
Conc. HNO₃can be transported in an aluminium container.

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Aluminium pieces dissolve in dilute NaOH to evolve dihydrogen gas whose presence can be used to open clogged drain.

2Al (s) + 2NaOH(aq) + 6H₂O(l)
↓
2 Na⁺[Al(OH)₄] ^–(aq) + 3H₂(g)
Sodium
tetra hydroxo aluminate(III)

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88.

Give reasons:
Aluminium alloys are used to make aircraft body.

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89.

Give reasons:
Aluminium utensils should not be kept in water overnight.

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90.

Give reasons:
Aluminium wire is used to make transmission cables.

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