Advertisements
Advertisements
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.
Advertisements
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
Name the gas evolved when the following mixtures are heated.
Sodium Nitrite and Ammonium Chloride
Name the Following:
Gas obtained by treating manganese with 1% nirtric acid.
Give reason for the following:
Nitric acid is used in purification of gold.
Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?
Name (formula is not acceptable) the gas produced in the following reaction:
On warming ammonium sulphate with sodium hydroxide solution.
Write the equation to show the reaction between the following:
Dilute nitric acid to produce carbon dioxide.
Why does pure nitric acid take on a yellowish brown colour when exposed to light?
Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.
Give one test to distinguish between the following pair of chemicals.
Zinc nitrate solution and calcium nitrate solution
Complete the table:
| Name of Process | Inputs | Equation | Output |
| Ammonia + Air | Nitric acid |
