JEE Main 2014Chemistryd and f Block ElementsHardMCQ

JEE Main 2014 — d and f Block Elements Question with Solution

JEE Main 2014 (06 Apr)

Question

The equation which is balanced and represents the correct product(s) is

Choose an option

Show full solutionCorrect option: B
Correct answer
BCoClNH35++5H+→Co2++5NH4++Cl-

Step-by-step explanation

Li 2 O + 2 KCl → 2 LiCl + K 2 O is incorrect since, KCl is less reactive than LiCl and will not form LiCl.

MgH2O62++EDTA4-→excess NaOHMgEDTA2++6H2O is incorrect since, the charge on the complex will be -2, not +2.

CuSO4+4KCN→K2CuCN4+K2SO4 is incorrect since, the final complex formed is K3CuCN4, not K2CuCN4.

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About this question

This is a previous-year question from JEE Main 2014, covering the d and f Block Elements 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.