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Sodium chromate on trement with lead ace...

Sodium chromate on trement with lead acetate gives a precipiate. This precipitate is dried and the solid is used as a pigment for road sign and markings. The solid is knnwn as

A

chrome yellow

B

white lead

C

red lead

D

chrome green

Text Solution

Verified by Experts

The correct Answer is:
A
Insoluble chromates are often yellow if the cation is coloress, e.g., `PbCrO_(4)`, although silver chromate, `Ag_(2)CrO_(4)`, has a unique brick-red color, making it a useful compound in the analysis of silver ion. The high insolubility of lead chromate (chrome yellow) and its high refractive index (hence high opacity) have resulted in its use for yellow highway markings. Guignet's green (emerald green), `3CrO_(3)` . `B_(2)O_(3)` . `4H_(2)O` is used as a green pigment.
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