In acidic medium, H2O2 changes \text{Cr}_{2}\text{O}_{7}^{-2} to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is:

  • Option 1)

    +5

  • Option 2)

    +3

  • Option 3)

    +6

  • Option 4)

    -10

 

Answers (1)

As we learnt in

Rules for Oxidation Number -

The oxidation number of oxygen in most compounds is -2. There are two exceptions.
In peroxide (H2O2; Na2O2),  the oxidation number is -1.

- wherein

In superoxide e.g. KO2 its oxidation number is -1/2.

 

 CrO5 has butterfly structure having two peroxo bonds.

peroxo oxygen has - 1 oxidation state. Let oxidation state of Cr be x. 

CrO5 : x + 4( - 1) + 1 (-2) = 0 

\Rightarrow x = +6

Correct option is 3.

 


Option 1)

+5

Incorrect

Option 2)

+3

Incorrect

Option 3)

+6

Correct

Option 4)

-10

Incorrect

Most Viewed Questions

Preparation Products

Knockout NEET Aug 2021 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 14000/- ₹ 4999/-
Buy Now
Knockout NEET Aug 2021

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 22999/- ₹ 9999/-
Buy Now
Test Series NEET Aug 2021

Unlimited Chapter Wise Tests, Unlimited Subject Wise Tests, Unlimited Full Mock Tests, Get Personalized Performance Analysis Report,.

₹ 6999/- ₹ 2999/-
Buy Now
Rank Booster NEET 2021

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Knockout NEET May 2022

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Weekend Live Classes, Mentorship from our Experts, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 34999/- ₹ 14999/-
Buy Now
Boost your Preparation for NEET 2021 with Personlized Coaching
 
Exams
Articles
Questions