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प्रश्न
Give two chemical tests for nitric acid.
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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.
\[\ce{4HNO3 ->[\Delta] 2H2O + \underset{\text{Brown fumes}}{4NO2} + O2}\]
APPEARS IN
संबंधित प्रश्न
Name the products formed when dilute HNO3 is added to copper.
How will you prepare the following from nitric acid?
Lead nitrate
Name a metal nitrate which on heating is changed into metal oxide.
The nitrate salt which does not give a mixture of NO2 and O2 on heating is ______.
In which ratio reactants are taken in Ostwald process?
Complete and balance the following equation :
Fe + HNO3(conc.) → _____________
Write a balanced equation for the production of nitrogen dioxide using copper.
Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?
Write the equation for the reaction of dilute nitric acid with copper.
Account for the yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle.
