Identify the gas from the following observations:
A reddish brown gas having a pungent smell. It turns moist potassium iodide paper brown.

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Solution

Nitrogen dioxide $({NO}_{2})$ gas has a pungent smell and turns moist potassium iodide paper brown.
These distinct colours and smells help in the qualitative analysis of the gases.
The analysis which aims at detecting the presence of any substance in a given sample is called qualitative analysis.
$\underset{(Nitrogen dioxide)}{2 {NO}_{2} (g)} + \underset{(Potassium iodide)}{2 KI (aq)} \to \underset{(Potassium nitrite)}{2 {KNO}_{2} (aq)} + \underset{(Iodine)}{I_{2} (g)}$

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Q. Identify the substances P, Q, and R in each case based on the information given below:
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Identify the gas from the following observations:A reddish brown gas having a pungent smell. It turns moist potassium iodide paper brown.

Identify the gas from the following observations:
A reddish brown gas having a pungent smell. It turns moist potassium iodide paper brown.