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Calcium and magnesium rank fifth and sixth in abundance in the:

AHuman body
BEarth's crust
COcean water
DAtmosphere
Answer & Solution
Correct answer: B. Earth's crust
1. These two alkaline earth metals are common. 2. Their rank is given among all elements. 3. They rank fifth and sixth in the earth's crust. _Source: syllabus Chemistry Part II, Unit 10, The s-Block Elements._
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