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Doctors Medicines MCQs Q&A

  1. Zinc oxide
  2. Chromium oxide
  3. Aluminium oxide
  4. Zinc carbonate
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Option 4 : Zinc carbonate

The correct answer is Zinc carbonate.

Concept:

Chemical reaction:

  • It is a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
  • A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Explanation:

  • We exhale carbon dioxide gas while breathing. 
  • So, the colorless, odorless gas released when the given metal compound is heated is carbon dioxide. 
  • Iron objects are usually electroplated with Zinc metal to protect them from corrosion. 
  • So, the metal compound should be Zinc carbonate.
  • The following reaction takes place when zinc carbonate is heated (in the limited supply of air):
    • ZnCO3 + Heat → ZnO + CO2 
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