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Byju's Answer
Standard VII
Chemistry
Indicators
give reason n...
Question
give reason nitric acid become brown when released in water.
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Solution
The reaction of water and nitric acid is simply an acid base reaction.
HNO
3
+ H
2
O
→
NO
3
-
+ H
3
O
ā+
(NO
3
-
•
HNO
3
)
+ H
2
O
→
(NO
3
-
• H
2
O •
HNO
3
)
Nitric acid has substantial quantity of dissolve NO
2
which give the solution a reddish brown coloration.
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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.
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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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