SSC CGL 2022 PYQ — Question 43

The correct answer is Option 3. i.e. MgO.

Magnesium oxide, also referred to as "magnesia," is an ionic compound created when an electron is transferred from a metal (magnesium) to a non-metal (oxygen). The minerals dolomite, silicate, and magnesite are rich sources of magnesium oxide (MgO). Saltwater also contains magnesium oxide, which is produced mostly by calcining magnesite or magnesium carbonate (MgCO3).
 

Calcination of Magnesite to Produce Magnesium Oxide-The most common procedure is calcining magnesium carbonate (MgCO3) to produce magnesium oxide. Magnesite is calcined in a variable-temperature kiln, releasing carbon dioxide gas as it breaks down into magnesium oxide.

MgO + CO2 = MgCO3