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Reactivity of Different Metals with Acids

Concentrated ...

Question

Concentrated nitric acid renders iron passive. Give reason. [2 MARKS]

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Solution

Reason: 2 Marks

Concentrated nitric acid renders iron passive due to the formation of an extremely thin layer of insoluble metallic oxide which stops further reaction.

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Q. Give reasons for the following:
Iron is rendered passive with fuming nitric acid.

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.

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

Q. Assertion :Aluminium containers used to transport nitric acid Reason: Concentrated

H N O_{3}

renders aluminium passive by forming a thin strong protective oxide layer. This protective layer prevents further reaction with the acid.

Q. Iron is rendered passive by treatment with concentrated

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