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Redox Reactions
Quiz 2
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Q.1
State the reducing agent in this reaction.Cu + 4HNO -> Cu(NO3)2 + 2H+ 2NO2
Cu
HNO3
Cu(NO3)2
NO2
Q.2
Check all the equations whereby the underlined substances has been oxidized.
iron (II) oxide + aluminium -> aluminium oxide + iron
hydrogen + oxygen -> water
Both A & B
copper (II) oxide + ammonia -> copper + nitrogen + water
Q.3
Name the oxidising agent in the following reaction:nitrogen + hydrogen -> ammonia
nitrogen
hydrogen
ammonia
Q.4
The ionic equation shows the reaction between zinc (Zn) and hydrochloric acid.Zn + 2H+ -> Zn+ H2What change takes place in the zinc?
It gains electrons
Its oxidation state increases
It is reduced
It gains hydrogen
Q.5
When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is
a reducing agent
an oxidizing agent
a combustible gas
a diffusible gas
Q.6
In the reaction, Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)
carbon monoxide is reduced
carbon monoxide is the oxidising agent
iron(III) oxide is oxidised
iron(III) oxide is the oxidising agent
Q.7
(a) Zn2+(aq) + 2e- -> Zn(s) -0.76(b) Cr3+(aq) + 3e- -> Cr(s) -0.(c) Fe2+(aq) + 2e- -> Fe(s) -0.41correct decreasing order of reducing agents is
a>b>c
b>a>c
c>a>b
c>b>a
Q.8
Name the following ionic compound: Cs2S
cesium sulfide
cesium sulfate
cesium (II) sulfate
cesium (II) sulfide
Q.9
A compound having +2 oxidation state of O is
H2O
H2O2
OF2
O2F2
Q.10
Which problem is balanced?
PbO2 + 2H2
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
Q.11
H2O2--> H+O2 is an example of
displacement reaction
combination reaction
decomposition reaction
disproportionation reaction
Q.12
In a voltaic cell electrons flow
through the salt bridge
from the cathode to the anode through the wire
from the anode to the cathode through the wire
Q.13
Which energy conversion shown below takes place in a voltaic cell?
Electrical to chemical
Mechanical to chemical
Mechanical to electrical
Chemical to electrical
Q.14
An increase in oxidation number.
more acidic
reduction
less basic
oxidation
Q.15
What is oxidation number of H in CaH2?
+1
-1
0
+2
Q.16
What is oxidation number of Cr in Cr2O72-?
-2
+2
+6
+12
Q.17
The basis of redox reactions is the
change in oxidation numbers
recombination of atoms in molecules
loss, gain, or bias of electrons
gain or loss of oxygen atom
Q.18
Bordo mix that is used in agriculture cannot be held in an iron container because iron reacts with the copper (II) sulphate. In the reaction, iron
is an oxidising agent
is a reducing agent
has a decrease in oxidation number
is reduced
Q.19
The correct description about redox reaction is
Oxygen is definitely present
The oxidising agent itself carries out oxidation
Oxidation takes place before reduction
Electron transfer definitely takes place
Q.20
Which one below is redox reaction?
CaCO3+2HCl⟶CaCl2+CO2+H2OCaCO_3+2HCl\longrightarrow CaCl_2+CO_2+H_2OCaCO3+2HCl⟶CaCl2+CO2+H2O
CaO+H2O⟶Ca(OH)2CaO+H_2O\longrightarrow Ca\left(OH\right)_2CaO+H2O⟶Ca(OH)2
SO2+2H2S⟶3S+2H2OSO_2+2H_2S\longrightarrow3S+2H_2OSO2+2H2S⟶3S+2H2O
NaCl+AgNO3⟶AgCl+NaNO3NaCl+AgNO_3\longrightarrow AgCl+NaNO_3NaCl+AgNO3⟶AgCl+NaNO3
0 h : 0 m : 1 s
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