Processing math: 61%

Home / Aptitude Tests / Chemistry / MnO4(aq) + 8H + 5Fe2...

MnO4(aq) + 8H + 5Fe2+ $\to$ Mn2+(aq) + 5Fe3+(aq) + H2O. Th...

MnO4(aq) + 8H + 5Fe2+ $\to$ Mn2+(aq) + 5Fe3+(aq) + H2O. The oxidation number of maganese in the above reaction changed from

A.

+7 to +2

B.

+6 to +2

C.

+5 to +2

D.

+4 to +2

View answer & explanation

Correct answer is A

$MnO_{{4}{(aq)}}$ has a charge of $-1$

Let the oxidation number of $Mn$ in $MnO_{{4}{(aq)}}$ be X

Recall, the oxidation number of $O_{2}$ is $-2$

$\therefore$ $X + (-2\times 4) = -1$

$X - 8 = -1$

$X = +7$

See all Chemistry questions & answers

See more JAMB questions & answers

Similar Questions

200cm3 each of 0.1M solutions of lead (II) trioxonitrate(V) and hydrochloric acid were mixed. Assumi...

The substance often use for vulcanization of rubber is ...

An aqueous solution of (NH4)2 SO4 is ...

When H2S gas is passed into a solution of iron (III) chloride, the colour changes from yellow to gre...

The rate of a chemical reaction is NOT affected by one of these factors ...

Which of the following dilute solutions has the lowest pH value? ...

Which of the following statements about the collision theory is correct? ...

Stainless steel is an alloy comprising of ...

X(g) → X $^-$ (g). The type of energy involved in the above transformation is?...

The following will decolourize acidified potassium tetraoxomanganate (VII) solution except ...

Aptitude Tests

Spatial Reasoning Questions and Answers

Situational Judgement Questions and Answers

Numerical Reasoning Questions and Answers

Typing Speed and Accuracy Test

Microsoft Office Questions and Answers

Data Interpretation Questions and Answers

Verbal Reasoning Questions and Answers

Personality Test

Nigeria General Knowledge Questions and Answers

Logical Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Puzzles Questions and Answers

Quantitative Reasoning Questions and Answers

View latest jobs in Nigeria today