📝 Multiple Choice Question
General-science
The valency of Ca is 2+. The valency of O is 2−. What is the simplified chemical formula of Calcium oxide?
A
Ca2O2
B
CaO
C
CaO2
D
Ca2O
Explanation
Because the calcium ion has a 2+ charge and the oxygen ion has a 2- charge, they perfectly balance each other in a 1:1 ratio, making the simplified empirical formula CaO.
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