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

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The products of the electrolysis of dilute sodium chloride solution with platinum electrodes are ____

A. hydrogen and oxygen
B. Sodium and chloride
C. sodium and oxygen
D. hydrogen and chlorine


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


During the preparation of ethene, it is passed through which of the following to remove impurities? (JAMB 2022)

A. NaHCO3
B. NaOH
C. K2CO3
D. Water


2H2O(l) + 2F2(g) → 4HF(aq) + O2(g)

In the reaction above, the substance that is being reduced is ____ (JAMB 2013)

A. F2(g)   B. HF(aq)   C. O3(g)   D. H2O(l)


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

 

 

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