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Home Questions & Answers General Knowledge Question Answers 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. The solid A is:

    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. The solid A is:

  • Zinc carbonate
  • Lead sulphate
  • Lead carbonate
  • Zinc sulphate
  • Explanation:

    Zinc carbonate gives out carbondioxide and ZnO on heating. Carbondioxide turns lime water milky. ZnO is yellow when hot and becomes white on cooling due to defect in its crystal structure