This analogy compares a chemical element to a compound primarily made from it. Just as sodium is a main component of salt (sodium chloride), calcium is a main component of marble (calcium carbonate). The relationship is element → compound containing that element.
Sodium : Salt ::
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the FBR - Federal Board of Revenue preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.