Chemistry Practice Test – Oxidation and Reduction (Questions with Answers and Explanations)

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Chemistry Practice Test – Oxidation and Reduction (Questions with Answers and Explanations)

Hello and Welcome to Chemistry Practice Test - Oxidation and Reduction

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MnO4-(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe3+(aq) + 4H2O(l)

In the equation above, Y is ______ (JAMB 2016)

A. 10H+(aq)   B. 5H+(aq)   C. 8H+(aq)   D. 4H+(aq)


The green colour of Fe2+ changes to brown Fe3- by ____ (JAMB 2018)

A. substitution
B. oxidation
C. reduction
D. conversion


Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

In the reaction above, the oxidation number of the reducing agent changes from _____ (JAMB 2014)

A. +1 to +3      B. 0 to +4      C. 0 to +2      D. +1 to +2


2H2O(l) + 2F2(g) → 4HF(aq) + O2(g)

In the reaction above, the oxidation number of oxygen changes from _____ (JAMB 2018)

A. -1 to 0
B. -2 to 0
C. 0 to +2
D. 0 to +1


The colour change observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is _____ (JAMB 2009)

A. yellow to purple
B. orange to green
C. green to orange
D. purple to yellow.

 

 

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