Question

give the characteristic test for NO2​

Answer 1

Answer:

Explanation:

The unique distinguishing characteristic of sulfur dioxide is its odour.lt scents like burning of sulfur.

Additionally, Sulfur dioxide diverts moist litmus paper from blue to red.

At the point when Soz is gone through acidified potassium permanganate solution (pink/purple in color), the solution turns green because of the development of Chromium sulfate.  

It is a redox reaction where Potassium dichromate goes about as an oxidizing agent and sulfur dioxide goes about as a reducing agent.

$Cr_{2} O_{7}^{2-} (aq) + 2 H+ (aq) + 3SO_{2} (g)$ → $2Cr^{3+} (aq) + H_{2} O (l) + 3SO_{4}^{2-} (aq)$

Answer 2

Answer: The gas is brown in colour. It has a pungent smell. It changes blue litmus paper to red.

Explanation:

Keep the moist blue litmus paper on the mouth of the test tube. Fill the test tube with the nitrogen gas and stopper it.

Within a few minutes, the blue litmus paper changes to red litmus paper. This indicates that an acidic gas is present in the test tube.