Home / Aptitude Tests / Chemistry / Consider the followi...
Consider the following equation: Cr2O2-

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
Similar Questions

The mass of one mole of \((NH_{4})_{2}CO_{3}\) is   [O=16.0, N=14.0, C=12.0, H=1.0]...

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to...

How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x \(10...

The IUPAC nomenclature for the structure above is ...

Which of the following is the correct order of decreasing activity of the metals Fe, Ca, Al and Na? ...

Which of the following reactions would be expected to have the highest entropy change? ...

Which of the followingstatements is TRUE? ...

Chlorophyll obtained from green leaves of plant can be shown to be composed of more than one co...

A liquid begins to boil when? ...

In the solubility curve above, water at 98oC is saturated with KCL and KCIO 3 What is the percentage...

Aptitude Tests

Nigeria General Knowledge Questions and Answers

Typing Speed and Accuracy Test

Numerical Reasoning Questions and Answers

Verbal Reasoning Questions and Answers

Situational Judgement Questions and Answers

Logical Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Data Interpretation Questions and Answers

Spatial Reasoning Questions and Answers

Personality Test

Microsoft Office Questions and Answers

Puzzles Questions and Answers

See all →