AIIMS2014ChemistryRedox Reactions
Assertion: The correct order of oxidising power is : VO ₂⁺ < Cr ₂ O ₇²⁻ < MnO ₄⁻ Reason: The oxidation state of Mn is +7 .
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
Step-by-step solution
The oxidation states of the given compounds are aligned & VO ₂⁺: x+2(-2)=+1 & x=+5 & Cr ₂ O ₇²⁻: 2 x+7(-2)=-2 & 2 x=+12 & x=+6 & MnO ₄⁻: x+4(-2)=-1 & x=-1+8=+7 aligned The correct order of oxidising power is VO ₂⁺ < Cr ₂ O ₇²⁻ < MnO ₄⁻ due to the increasing stability of the lower species to which they are reduced.