1.

A white solid 'A' on heating gives off a gas which turns lime water milky. The residue is yellow when hot but turns white on cooling. This solid 'A' is

Answer»

ZINC sulphide
Zinc carbonate
Lead sulphate
Lead carbonate

Solution :`ZnCO_(3) overset(DELTA)toZnO+ underset("TURNS lime water milky")(CO_(2))`
`(Hot)underset("YELLOW")(ZnO) HARR underset("white")(ZnO)(co ol)`


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