General Science • ChemistryMedium
Which of the following gases turns moist lead acetate paper silvery black due to the formation of lead sulfide precipitate?
A. Carbon dioxide
B. Hydrogen sulfide✓ Correct Answer
C. Ammonia
D. Sulfur dioxide
💡 Solution & Explanation
Hydrogen sulfide gas reacts with moist lead acetate paper to produce a black precipitate of lead sulfide, serving as a classic confirmatory laboratory test for sulfide ions. Carbon dioxide turns lime water milky due to calcium carbonate formation, while ammonia produces dense white fumes with hydrogen chloride gas. Sulfur dioxide decolorizes acidified potassium permanganate solutions. Hydrogen sulfide possesses a characteristic odor resembling rotten eggs.
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