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Thermal Dissociation of Nitric Acid

The colour th...

Question

The colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle is :

A

yellow

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B

black

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C

blue

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D

brown

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Solution

The correct option is A yellow
Nitric acid slowly decomposes even at room temperature specially in the presence of sunlight.
${4 H N O}_{3} \to 4 {N O}_{2} + H_{2} O + O_{2}$
Liberated nitrogen dioxide dissolves in the acid and gives a yellow colour.

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Explain the following:

Concentrated nitric acid appears yellow when it is left standing in a glass bottle.

Q. (i) Dilute nitric acid is generally considered to be a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals?
(ii) Write the equation for the reaction of dilute nitric acid with copper.
(iii) Account for the yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.

Q. Explain the following :
i)

D i l . H N O_{3}

is generally considered a typical acid but not so in the reaction with metals.
ii) Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
iii) In the laboratory preparation of nitric acid an all-glass apparatus is used.

Q. Give reasons for the following:
Commercial concentrated nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
Give one chemical test for nitric acid.

Q. An ordinary glass bottle cracks when boiling water is poured into it, but a borosilicate glass bottle does not.

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