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प्रश्न
Explain with the help of a balanced equation, the brown ring test for nitric acid.
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उत्तर
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
Name a metal nitrate which on heating is changed into metal.
What is the purpose of Conc. H2SO4 in the above preparation?
Can we use conc. HCl in place of Conc. H2SO4 ?
Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3, State the reason.
Give reason for the following:
In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
What do you observe when?
Concentrated nitric acid is dropped on a hot surface?
Choose the correct answer from the option given below :
Nitric acid on standing develops brownish colour which may be attributed to the presence of :
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.
Identify the gas evolved when sulphur is treated with concentrated nitric acid.
Write a balanced equation for following :
Reaction of ammonia with nitric acid
