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Redox Mastery: Oxidation and Reduction

Section A: Oxidation and Reduction Basics

Question 1mcq
Oxidation can be defined as:
A.Loss of reactants
B.Gain of oxygen
C.Gain of hydrogen
D.Loss of oxygen
Question 2mcq
Reduction can be defined as:
A.Gain of oxygen
B.Formation of precipitate only
C.Loss of oxygen
D.Breaking into smaller pieces
Question 3mcq
Loss of hydrogen is also called:
A.Oxidation
B.Reduction
C.Neutralisation
D.Precipitation
Question 4mcq
Gain of hydrogen is called:
A.Reduction
B.Oxidation
C.Thermal decomposition
D.Combination only
Question 5mcq
In CuO+H2→Cu+H2OCuO + H_2 \rightarrow Cu + H_2O, CuOCuO is:
A.Reduced
B.A precipitate only
C.Oxidised
D.Unchanged as a catalyst
Question 6mcq
In CuO+H2→Cu+H2OCuO + H_2 \rightarrow Cu + H_2O, H2H_2 is:
A.Oxidised
B.Reduced
C.A precipitate
D.Not reacting

Section B: Redox in Equations

Question 7mcq
In ZnO+C→Zn+COZnO + C \rightarrow Zn + CO, carbon is:
A.A catalyst
B.Reduced
C.A precipitate
D.Oxidised
Question 8mcq
In ZnO+C→Zn+COZnO + C \rightarrow Zn + CO, ZnOZnO is:
A.Unchanged
B.Reduced
C.Oxidised
D.Dissolved only
Question 9mcq
In 2Cu+O2→2CuO2Cu + O_2 \rightarrow 2CuO, copper is oxidised because it:
A.Loses oxygen
B.Gains hydrogen
C.Gains oxygen
D.Forms a gas
Question 10mcq
In Fe2O3+2Al→Al2O3+2FeFe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe, Fe2O3Fe_2O_3 is reduced because it:
A.Gains oxygen
B.Gains aluminium as a catalyst
C.Turns into a gas
D.Loses oxygen
Question 11mcq
In the thermite reaction Fe2O3+2Al→Al2O3+2FeFe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe, aluminium is:
A.A salt solution
B.A precipitate
C.Reduced
D.Oxidised
Question 12mcq
A redox reaction involves:
A.Only melting
B.Oxidation and reduction occurring together
C.Only physical separation
D.Only evaporation