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Redox Reactions
Quiz 3
Solution
Q.1.
In which reaction below, the oxidation number of nitrogen changes from +5 to +2?
2NO+O2⟶2NO2 2NO+O_2\longrightarrow2NO_{2\ }2NO+O2⟶2NO2
N2+3Mg⟶Mg3N2N_2+3Mg\longrightarrow Mg_3N_2N2+3Mg⟶Mg3N2
4NH3+5O2⟶4NO+6H2O4NH_3+5O_2\longrightarrow4NO+6H_2O4NH3+5O2⟶4NO+6H2O
Cu+4HNO3⟶Cu(NO3)2 +2NO+2H2OCu+4HNO_3\longrightarrow Cu\left(NO_3\right)_{2\ }+2NO+2H_2OCu+4HNO3⟶Cu(NO3)2 +2NO+2H2O
Q.2.
Which one below is BOTH oxidising agent and reducing agent?
NaNaNa
SO2 SO_{2\ }SO2
Cl2 Cl_{2\ }Cl2
CO2 CO_{2\ }CO2
Q.3.
Which compound has manganese with oxidation number +6?
K2MnO4K_2MnO_4K2MnO4
KMnO4KMnO_4KMnO4
MnO2 MnO_{2\ }MnO2
MnCl2 MnCl_{2\ }MnCl2
Q.4.
An element in a compound turns into an element in a chemical reaction. The element ...
is definitely oxidised
is definitely reduced
may have been oxidisied or reduced
is neither oxidised nor reduced
Q.5.
What is the colour change of acidified KMnO4(aq) solution when serving as oxidizing agent?
From green to orange
From orange to green
From purple to blue
From colourless to purple
Q.6.
What is the reducing agent of this reaction?3Mg + N2−−−−> Mg3N2
Mg
N2
Mg3N2
MgN
Q.7.
What is the oxidizing agent of this reaction?3Mg + N2−−−−> Mg3N2
Mg
N2
Mg3N2
MgN
Q.8.
What is the species that gain electrons in a redox reaction?
oxidizing agent
reducing agent
is oxidized
increases in oxidation number
Q.9.
What is oxidation number of O in O2 ?
0
-2
+1
+2
Q.10.
The sum of the oxidation numbers in SCN- is equivalent to
0
-1
+1
+3
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