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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.
\[\ce{4HNO3 ->[\Delta] 2H2O + \underset{\text{Brown fumes}}{4NO2} + O2}\]
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संबंधित प्रश्न
How will you prepare the following from nitric acid?
Ferric nitrate
Name a metal nitrate which on heating is changed into metal oxide.
Name the Following:
Salt referred to as chile saltpeter.
Give reason for the following:
In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
What happens when (Given balanced equation) :
Sulphar is added to hot and conc. HNO3?
Complete and balance the following equation :
Fe + HNO3(conc.) → _____________
Write the balanced equation for the equation preparation of nitric acid from potassium nitrate.
Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.
What happens when
Common salt solution is added to silver nitrate solution and NH3 solution add to it.
A dilute acid B does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper. Identify B. Write the equation with copper.
