JEE Main 2018ChemistryD And F Block ElementsProperties Of Transition ElementsmediumMCQ

JEE Main 2018 — D And F Block Elements Question with Solution

From: JEE Main 2018 (Online) 16th April Morning Slot

Question

The incorrect statement is :

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Show full solutionCorrect option: B
Correct answer
BCu2+ and Ni2+ ions give black precipitate with H2S in presence of HCl solution.

Step-by-step explanation

Cu2+ and Ni2+ ions belong to Group II and Group IV respectively.

JEE Main 2018 (Online) 16th April Morning Slot Chemistry - d and f Block Elements Question 182 English Explanation

Group II sulphides precipitated out even under low concentration of sulphides, while Group IV sulphides require higher concentration of sulphides. To fulfill this reaction condition, dil. HCl is chosen in Group II reagents and NH4OH is chosen in Group IV reagents.

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About this question

This is a previous-year question from JEE Main 2018, 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.