Consider the following equation: Cr2O2-7(aq) + 14H+(aq) + 6e- → 2Cr3+(ag) + 7H2O(1). The oxidation number of chromium changes from

Assessment: WAEC SSCE - Chemistry - 2002 (Objective) Subject: Chemistry

Question 1 Report

Consider the following equation: Cr2O2-7(aq) + 14H+(aq) + 6e- → 2Cr3+(ag) + 7H2O(1). The oxidation number of chromium changes from
Answer Details
The oxidation number is a number that represents the charge of an atom in a compound. In the given equation, the chromium atom changes from a +6 oxidation state on the reactant side (Cr2O2-(aq)) to a +3 oxidation state on the product side (2Cr3+(aq)). This means that the oxidation number of chromium has decreased by 3, indicating that it has undergone reduction. Therefore, the correct answer is +6 to +3.
Read lesson note on Oxidation And Reduction (JAMB)
View Answer

Related Questions

1

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?
2

Which of the following processes takes place during the production of margarine from vegetable oils?
3

Which of the following ions require the largest quantity of electricity for discharge at an electrode?
4

If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the
5

Consider the following equation; Cr2O7(aq)2- + 14H+(aq) + 6e- → 2Cr3+(aq) + 7H2O(I). The oxidation number of chromium changes from
6

The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?
7

Which of the following compounds can be represented by the molecular formula C2H6O?
8

If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

Download The App On Google Playstore

Everything you need to excel in your exams

Green Bridge CBT Mobile App
Personalized AI Learning Chat Assistant
200,000+ Exam Questions Across IGCSE, JAMB, WAEC & NECO
Over 3,900 Lesson Notes
Offline Support - Learn Anytime, Anywhere
Green Bridge Timetable
Literature Summaries & Potential Questions
Track Your Performance & Progress
In-depth Explanations for Comprehensive Learning