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प्रश्न
Explain why nitric acid is kept in a reagent bottle for a long time.
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उत्तर
Pure nitric acid is unstable to heat or sunlight. In the presence of sunlight, it decomposes even at room temperature.
\[\ce{4HNO3 ->[Heat][Sunlight]4NO2 + 2H2O + O2}\]
This decomposition produces nitrogen dioxide (NO2), a reddish-brown gas, which dissolves in nitric acid and turns it yellow over time. To prevent decomposition, nitric acid is stored in dark-coloured reagent bottles, which reduce its exposure to light and help maintain its purity for a long time.
संबंधित प्रश्न
Write a balanced chemical equation for the following:
Action of cold and dilute Nitric acid on Copper
Give a balanced chemical equation for Laboratory preparation of Nitric acid.
Name the products formed when carbon and conc. nitric acid is heated.
Ammonia is used in the Ostwald process.
Name the oxidising agent used in this process.
How will you prepare the following from nitric acid?
copper nitrate
Can we use conc. HCl in place of Conc. H2SO4 ?
Describe the Ostwald's process for the manufacture of nitric acid with labeled diagram.
Give reason for the following:
Commercial nitric acid is yellow in colour, but when it is diluted with water, it turns colourless.
Write balanced equation and name the product formed when :
Cupric oxide reacts with nitric acid.
Why does pure nitric acid take on a yellowish brown colour when exposed to light?
