what is the test for NO2-

what is the test for NO2-


1 Answers

Aman Bansal
592 Points
11 years ago

Dear Shamsher,


No simple test to clearly i.d. it, (i) in acid solution it decomposes to give colourless NO gas which rapidly oxidises to nasty brown fumes of NO2, (ii) it decolourises (purple ==> colourless) acidified potassium manganate(VII), (iii) it liberates iodine from acidified potassium iodide solution, (iv) forms ammonia with hot Al powder-foil/NaOH(aq) (see nitrate test) and gives brown ring  test - see nitrate tests above


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