Identifying harmful gas in the atmosphere.
In order to test the air quality in an area, people take 2 liters of air and then use it to aerate a solution.
After all chemical reactions have stopped, a black precipitate weighing is gained in the process.
Which of the following must have been in the air? Choose the best answer.
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1 solution
PbS is black in color and is formed as a precipitated residue when Pb(NO3)2 reacts with H2S .