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Q.

A white solid which gives a yellow residue on heating is: 

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a

Copper sulphate

b

Hydrogen sulphide

c

Copper oxide

d

Lead carbonate

answer is D.

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Detailed Solution

On heating, molecules gain energy and break their bond. The process is decomposition. In the given options when thermally decomposed lead carbonate gives a yellow solid of lead oxide.

At various temperatures, different substances undergo thermal breakdown. Some decompose at a greater temperature, while others do so at a lower temperature to release their constituent metals, fumes, compounds, or gases.
In our situation, lead carbonate PbCO3 is a white-coloured solid compound that, when exposed to heat, decomposes into a deadly yellow chemical, PbO, along with the release of carbon dioxide gas.
The temperature at which this reaction occurs is more than 315oC. Here is the reaction that occurs-
PbCO3PbO+CO2

Hence, the correct answer is option D.

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