JEE Main 2021 — D And F Block Elements Question with Solution
From: JEE Main 2021 (Online) 24th February Evening Shift
Question
The incorrect statement among the following is :
Choose an option
Show full solutionCorrect option: D
Correct answer
DRed colour of ruby is due to the presence of Co3+
Step-by-step explanation
Red colour of ruby is due to presence of (chromium ions), not (cobalt ions). in Al2O3.
Chromium is the trace element that causes ruby’s red colour, which
ranges from an orange red to a publish red. The strength of ruby’s
red depends on how much chromium is present.
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This is a previous-year question from JEE Main 2021, 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.