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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
What is meant by the following term?
Fuming nitric acid
Give reason for the following:
In laboratory preparation of nitric acid all the apparatus including cork should be made up of glass.
Complete and balance the following equation :
FeSO4 + NO + H2O → ______________
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.
Name the product, catalyst and approximate temperature maintained in Ostwald's process. How is the temperature maintained in the Ostwald's process?
Why does pure nitric acid take on a yellowish brown colour when exposed to light?
When nitric acid is prepared by the action of concentrated sulphuric acid on potassium nitrate. what is the special feature of the apparatus used?
The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid:
(i) Name A (a liquid), B( a Solid) and C(a liquid).
(ii) write the balanced chemical equation to show how nitric acid undergoes decomposition.
(iii) Write the balanced chemical equation for the reaction in which copper is oxidized by concentrated nitric acid.
Name the gas evolved:
The gas produced on heating sodium nitrate.
Lead nitrate decomposes on heating to give ______.
