QQuestion
Write the formula of the black precipitate formed when H₂S gas is passed through an aqueous solution of lead nitrate.
✓Answer
PbS (Lead sulphide)
Explanation
When H₂S gas is passed through an aqueous solution of lead nitrate, a black precipitate of lead sulphide (PbS) is formed.
Pb(NO₃)₂ + H₂S → PbS↓ + 2HNO₃
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