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प्रश्न
Explain the following:
Concentrated nitric acid appears yellow when it is left standing in a glass bottle.
Explain the following:
When it is left standing in a glass bottle, concentrated nitric acid appears yellow.
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उत्तर १
Although pure concentrated nitric acid is colourless, it appears yellow when left standing in a glass bottle due to the dissolution of reddish-brown nitrogen dioxide gas in the acid. The thermal decomposition of a portion of nitric acid produces nitrogen dioxide.
\[\ce{4HNO3 -> 2H2O + 4NO2 + O2}\]
उत्तर २
When exposed to sunshine, conc. nitric acid slowly decomposes into nitrogen dioxide gas, which is reddish brown. Nitrogen dioxide gas dissolves in nitric acid, causing it to turn yellow.
संबंधित प्रश्न
Give two chemical equations for the following:
Nitric acid showing as acidic character.
Write a balanced equation and name the products formed when cupric oxide reacts with nitric acid.
How will you prepare the following from nitric acid?
copper nitrate
Mention three important uses of nitric acid. Give the property of nitric acid involved in the use.
The chemical used in the brown ring test is ______.
Give reason for the following:
Commercial concentrated nitric acid is yellow in colour, but when it is dilute with water, it turns colourless.
Give one chemical test for nitric acid.
Write balanced equation for the reaction between nitrogen and oxygen, when lightning strikes.
Name (formula is not acceptable) the gas produced in the following reaction:
By the action of concentrated nitric acid on copper.
Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200oC?
Complete the table:
| Name of Process | Inputs | Equation | Output |
| Ammonia + Air | Nitric acid |
