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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?

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Short Answer Type

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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87.

Give reasons:
A mixture of dilute NaOH and aluminium pieces is used to open drain.

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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.

This is because aluminium reacts with H₂O and dissolved O₂ to form a thin film of aluminium oxide along with dihydrogen.

A very-very small quantity of Al₂O₃ may dissolve in water to give a few ppm of Al³⁺ions in the solution. Accumulation of these Al³⁺ ions can cause permanent damage to the human systems. Hence, drinking water should not be kept in aluminium utensils overnight.

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