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Nitric Acid

Which of the ...

Question

Which of the following is rendered passive by concentrated nitric acid?

A

A l

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B

A u

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C

P b

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D

S n

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Solution

The correct option is A $A l$
AIuminium is rendered passive by concentrated nitric acid because when aluminium comes into contact with nitric acid, an impervious layer of aluminium oxide is formed. This layer of aluminium oxide will prevent the nitric acid from coming into contact with the inner aluminium metal. Thus, this layer protects and prevents further reaction.

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Q. Give reasons for the following:
(i) In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
(ii) Commercial nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
(iii) Aluminium does not react with nitric acid of any concentration.
(iv) Conc. nitric acid renders iron passive.
(v) Nitric acid is used in purification of gold.
(vi) Aqua regia dissolves gold and platinum.
(vii) Nitric acid usually does not yield hydrogen from acids.
(viii) Lightning is a blessing in disguise.
(ix) Concentrated nitric acid is brown in colour.
(x) Concentrated nitric acid is a stronger oxidizing agent.

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