JEE Main 2013 — Some Basic Concepts of Chemistry Question with Solution
JEE Main 2013 (07 Apr)
Question
Experimentally it was found that a metal oxide has formula . Metal M, is present as and in its oxide. Fraction of the metal which exists as would be:
Choose an option
Show full solutionCorrect option: D
Correct answer
D
Step-by-step explanation
Consider one mole of the oxide, then
Moles of M = 0.98; Moles of O2- = 1
Let 'x' moles of M are in +3 oxidation state, then Moles of M2+ = 0.98-x
On doing charge balancing we get
(0.98 - x)2 + 3x = 2
Or 1.96 - 2x + 3x - 2 = 0
Or x = 0.04
Moles of M = 0.98; Moles of O2- = 1
Let 'x' moles of M are in +3 oxidation state, then Moles of M2+ = 0.98-x
On doing charge balancing we get
(0.98 - x)2 + 3x = 2
Or 1.96 - 2x + 3x - 2 = 0
Or x = 0.04
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This is a previous-year question from JEE Main 2013, 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.