JEE Main 2015ChemistrySome Basic Concepts of ChemistryHardMCQ

JEE Main 2015 — Some Basic Concepts of Chemistry Question with Solution

JEE Main 2015 (04 Apr)

Question

The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na molecular weight=206. What would be the maximum uptake of Ca2+ ions by the resin if expressed in mol per gm?

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Show full solutionCorrect option: A
Correct answer
A1412

Step-by-step explanation

2C8H7SO3Na aq+Ca2+ aq→C8H7SO32Ca aq+2Na+aq

1 mol calcium ion reacts with 2 moles of resin

2 mol resin=412 gresin≡40 gCa2+ions
=1 mol of Ca2+ions
∴ Moles of Ca2+ per g of resin=1412

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About this question

This is a previous-year question from JEE Main 2015, 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.