Question

Lead Acetate when reacts with `A', gives black ppt

• A. PbCl₂
• B. PbCO₃
• C. PbCrO₄
• D.

Answer 1

The correct option is D

Try to recall the properties of Lead acetate.
When $H_{2}S$ gas is passed through the solution of $(C{H}_{3}COO{)}_{2}Pb$, black ppt. of PbS is formed.
$(C{H}_{3}COO{)}_{2}Pb+H_{2}S\to 2C{H}_{3}COOH+PbS­\downarrow$
Black ppt.
But,
With potassium chromate $K_{2}Cr{O}_4$:
$(C{H}_{3}COO{)}_{2}Pb+K_{2}Cr{O}_4\to PbCr{O}_4­\downarrow +2C{H}_{3}COOK$
Lead chromate
(yellow ppt.)
On addition of HCl in $(C{H}_{3}COO{)}_{2}Pb$ solution, white ppt of $PbC{l}_{­}2$­ is formed in cold conditions, which dissolves on heating. On cooling, $PbC{l}_{­}2$ reaooears as a white crystalline solid.
$(C{H}_{3}COO{)}_{2}Pb+2HCl\to PbC{l}_2+2C{H}_{3}COOH$
dilLead chloride
(white ppt).
and same with $NaHC{O}_3$,
$(C{H}_{3}COO{)}_{2}Pb+2NaHC{O}_3\to PbC{O}_3\downarrow +2C{H}_{3}COONa$
(white ppt)