On passing a gas, 'X', through Nessler's reagent, a brown precipitate is obtained. The gas 'X' is

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Step 1: Recall Nessler's Reagent

Nessler's reagent is an alkaline solution of potassium tetraiodomercurate(II) ( in  or ).

Step 2: Consider the reaction with specific gases

Nessler's reagent is the standard diagnostic test for the presence of ammonia () gas or ammonium () ions. 
When ammonia gas is passed through Nessler's reagent, a brown or yellow-brown precipitate forms.

This brown precipitate is known as the iodide of Millon's base.

Step 3: Eliminate other options

-  gas typically f

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