Q
In CaO, Ca and O are present in the ratio ______ by mass.
RRB Group D, 15-Oct-18 S-1
2018
✓ Answer:
B
5:2
In calcium oxide (CaO), the ratio of calcium (Ca) to oxygen (O) by mass is 5:2. This is derived from their atomic masses: calcium has an atomic mass of 40u, and oxygen has an atomic mass of 16u. Therefore, the mass ratio is calculated as 40:16, which simplifies to 5:2.
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