JEE Main 2026 — Some Basic Concepts of Chemistry Question with Solution
JEE Main 2026 (06 April Shift 1)
Question
An oxide of iron contains iron, its empirical formula, is: (Given: Molar mass of Fe and O are and g mol respectively.)
Choose an option
Show full solutionCorrect option: B
Correct answer
B
Step-by-step explanation
Mass percentage of
Mass percentage of
Number of moles of
Number of moles of
Molar ratio of
Dividing by the smallest value, the ratio is
Multiplying by to get the simplest whole number ratio, we get .
The empirical formula is .
Answer:
Mass percentage of
Number of moles of
Number of moles of
Molar ratio of
Dividing by the smallest value, the ratio is
Multiplying by to get the simplest whole number ratio, we get .
The empirical formula is .
Answer:
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This is a previous-year question from JEE Main 2026, covering the Some Basic Concepts of Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.