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प्रश्न
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.
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उत्तर
Commercial nitric acid is yellow in colour because of presence of nitrogen dioxide but when it is dilute with water, it turns colourless because nitrogen dioxide gets dissloved in water.
Brown ring test can be used to test nitric acid:
Brown ring test : Nitric acid in a test tube is taken and then and then freshly prepared ferrous sulphate solution is added. Concentrated H2SO4 is then added carefully down the sides of the test tube, dark brown ring is formed at the junction of two layers.
\[\ce{6FeSO4 + 3H2SO4 + 2HNO3 -> 3Fe2(SO4)3 + 2NO + 4H2O}\]
\[\ce{FeSO4 + NO + 5H2O -> \underset{\text{Hydrated nitrosoferrous sulphate(brown ring)}}{[Fe(NO)(H2O)5]SO4}}\]
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संबंधित प्रश्न
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.
Give the sources of reactants used in this process.
Ammonia is used in the Ostwald process.
Why is quartz used in this process?
Name the oxide of nitrogen which turns brown on exposure to air. How is it prepared?
Explain with the help of a balanced equation the brown ring test for nitric acid.
Why is the temperature maintained at 200°C in the above reaction?
Give reason for the following:
Aluminum does not react with nitric acid of any concentration.
What do you observe when?
Hydrogen sulphide is bubbled through conc. HNO3?
Complete and balance the following equation :
Fe + HNO3(conc.) → _____________
