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

A.

-2 to + 3

B.

-2 to + 6

C.

+6 to +3

D.

+7 to + 6

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

See all Chemistry questions & answers
See more WAEC questions & answers
Aptitude Tests

Data Interpretation Questions and Answers

Verbal Reasoning Questions and Answers

Puzzles Questions and Answers

Personality Test

Microsoft Office Questions and Answers

Abstract Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Logical Reasoning Questions and Answers

Spatial Reasoning Questions and Answers

Typing Speed and Accuracy Test

Nigeria General Knowledge Questions and Answers

Numerical Reasoning Questions and Answers

Situational Judgement Questions and Answers

See all →


View latest jobs in Nigeria today