State the colour of the residue obtained when hot lead carbonate is cooling :

white

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blue

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green

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yellow

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Solution

The correct option is D yellow
Lead carbonate is a white amorphous powder which changes to yellow colour on heating ( residue is - lead(II) oxide also called litharge or lead monoxide ). A colourless and odourless gas is evolved which turns lime water milky. $P b C O_{3} + H e a t \to P b O + C O_{2}$

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