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प्रश्न
Give two chemical tests for nitric acid.
उत्तर
Two tests for nitric acid are-
(i) Brown ring test :
Nitric acid in a test tube is taken 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.
\[\ce{6FeSO4 + 3H2SO4 + 2HNO3 -> 3FE2(SO4)3 + 2NO + 4H2O}\]
\[\ce{FeSO4 + NO + 5H2O -> \underset{\text{Hydrated nitrosoferrous Sulphate(brown ring)}}{[Fe(NO)(H2O)5]SO4}}\]
(ii) Nitric acid on heating gives brown fumes of nitrogen dioxide.
\[\ce{4HNO3 ->[\Delta] 2H2O + \underset{\text{Brown fumes}}{4NO2} + O2}\]
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संबंधित प्रश्न
Write balanced equations for Action of heat on a mixture of copper and concentrated nitric acid
How will you prepare the following from nitric acid?
Magnesium nitrate
Name the oxide of nitrogen which turns brown on exposure to air. How is it prepared?
The chemical used in the brown ring test is ______.
Name the Following:
Gas obtained by treating manganese with 1% nirtric acid.
How is nitric acid prepared in laboratory?
Give the name of a soluble lead salt and write the eqution for the action of heat on this salt. Write the equation for the preparation of nitric acid from potassium nitrate.
Describe what you see when concentrated nitric acid is added to copper.
Name the compounds required for the laboratory preparation of nitric acid.
Identify the gas evolved when sulphur is treated with concentrated nitric acid \[\ce{NH3}\].
