Verified Solution • 2025–26 Session moderate

QJEEM21Chffdc: JEE Main 2021 Chemistry - Class 12 JEEM21Chffdc Solution: The incorrect statement among the following is :

The incorrect statement among the following is :

Multiple Choice Options

  • A RuO4 is an oxidizing agent
  • B Cr2O3 is an amphoteric oxide.
  • C VOSO4 is a reducing agent
  • D Red colour of ruby is due to the presence of Co3+

Step-by-Step Verified Solution

Red colour of ruby is due to presence of Cr3+{Cr}^{3+} (chromium ions), not Co3+{Co}^{3+} (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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