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प्रश्न
Give reason why concentrated nitric acid prepared in the laboratory is yellow in colour. State how the colour of the acid is removed.
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उत्तर
The acid prepared in the laboratory decomposes slightly due to heat, releasing brown nitrogen dioxide (NO2) gas. This gas dissolves back into the acid, giving it a yellow colour.
\[\ce{4HNO3 ->[\Delta] 2H2O + 4NO2 + O2}\]
The yellow colour can be removed by bubbling dry air or carbon dioxide (CO2) gas through the acid to drive out the dissolved NO2, or by adding a little water, which converts the NO2 back into nitric acid.
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संबंधित प्रश्न
State one relevant observation for the following:
When crystals of copper nitrate are heated in a test tube.
Write a balanced equation for the action of warm water on magnesium nitride.
Write a balanced equation and name the products formed when concentrated nitric acid is heated.
Write the balanced equation for the following:
Action of concentrated nitric acid on copper.
The following statement is correct only under certain conditions. Rewrite the statement including the appropriate condition(s) and underline it in your answer.
Copper and nitric acid react together to produce nitrogen dioxide.
Write the equation to show the reaction between the following:
Between copper and concentrated nitric acid.
Write equation to show the reaction between the following:
Copper and concentrated nitric acid.
Fill in the blank using the appropriate words given below:
Hot, concentrated nitric add reacts with sulphur to form ______.
Write a balanced equation for following :
Action of cold and dilute nitric acid on copper
Write sqauential observation for effect of heat on Copper nitrate.
