Oxidation and reduction Generix Content - Oxidation and reduction
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JAMB questions for "Chemistry :: Oxidation and reduction"
Q1

The IUPAC nomenclature of the compound LiAIH4 is

A

tetrahydrido lithium aluminate (III)

B

lithium aluminium hydride

C

lithium tetrahydridoaluminate (II)

D

aluminium tetrahydrido lithium

E
Q2

In the preparation of oxygen by heating KCIO3 in the presence of MnO2, only moderate heat is needed because the catalyst acts by

A

increasing the rate of the reaction

B

lowering the energy barrier of the reaction

C

lowering the pressure of the reaction

D

increasing the surface area of the reactant

E
Q3

The oxidation of ammonia in excess air produces

A

NO

B

N2O

C

NO2

D

N2O4

E
Q4

Hydrogen sulphide gas can act as 

A

an oxidizing agent

B

a dehydrating agent

C

a bleaching agent

D

a precipitating agent

E
Q5

The oxidation state of carbon in HCOOH is 

A

-1

B

+2

C

+3

D

0

E
Q6

What is the IUPAC nomenclature of the compound NaClO?

A

Sodium oxochlorate (I)

B

Sodium chloro (I) oxide

C

Sodium monoxochlorate (II)

D

Sodium chloro (I) monoxide

E
Q7

The IUPAC nomenclature, for the structure above is 

A

2,3 - dichloro - 4, 4, 5 - trimethyl pent - ene

B

4,5 - dichloro - 2,3 - diimethyl hex -2- ene

C

 

2,3 - dichloro - 4,4 - diimethyl hex -2- ene

 

D

 

2,3 - dichloro - 2,2 - diimethyl hex -2- ene

 

E
Q8

The reaction that takes place in a Daniell cell is

A

double decomposition

B

neutralixation

C

redox

D

direct combination

E
Q9

The oxidation state of oxygen in tetraoxosulphate (VI) acid is 

A

-8

B

-4

C

-2

D

+4

E
Q10
An element will readily form an electrovalent compound if its electron configuration is
A
2, 8, 8
B
2, 8, 4
C
2, 8, 5
D
2, 8, 1
E
Q11
The IUPAC nomenclature for the hydrocarbon above is
A
3-methylbut-1ene
B
1,1-dimethylprop-2-ene
C
1,2-dimethylprop-2-ene
D
2-methylbut-3-ene
E
Q12
In which of the following reactions can the oxidation number of nitrogen be said to have increased?
A
FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
B
2NO(g) + O2(g) → 2NO2(g)
C
NO(g) + Cl2(g) → NOCl2(g)
D
NO(g) + Br2(l) → NOBr2(l)
E
Q13
Transition metals possess variable oxidation states because they have
A
electrons in the s orbitals
B
electrons in the d orbitals
C
partially filled p orbitals
D
a variable number of electrons in the p orbitals
E
Q14
The IUPAC nomenclature of the compound above is 
A
3, 4-dimethylhexane
B
2, 3-dimethylhexane
C
2-ethylhexane
D
2-ethylpentane
E
Q15
The oxidation state of chlorine in HClO4 is
A
-1
B
-5
C
+7
D
+1
E
Q16
Which of the following acts as both a reducing and an oxidizing agent?
A
H2S
B
CO2
C
H2
D
SO2
E
Q17
The commonest feature of reactions at the anode is that
A
electrodes dissolves
B
electrons are consumed
C
oxidation is involved
D
ions are reduced
E
Q18
If Y is an oxidizing agent that reacts with a reducing agent, Z, which of the following is correct?
A
Z loses protons
B
Z gains protons
C
Y becomes reduced
D
Y increases in oxidation number
E
Q19
The intermediate product formed when ethanol is progressively oxidized to ethanoic acid with potassium heptaoxodichromate (VI) is
A
butanal
B
ethanal
C
methanal
D
propanal
E
Q20
The correct order of increasing oxidation number of the transition metal ions for the compounds K2Cr2O7, V2O5 and KMnO2 is
A
V2O5 < K2Cr2O7 < KMnO4
B
K2Cr2O7 <  KMnO4
C
KMnO4 <  K2Cr2O7
D
KMnO4 < V2O5
E
Q21
2FeCl2(s) + Cl2(g) &#8594; 2FeCl3(s). The reducing agent in the reaction above is
A
FeCl2
B
Cl2
C
FeCl3
D
Fe
E
Q22
The reaction that is accompanied by a decrease in entrophy when carried out at constant temperature is
A
N2O4(g) &#8596; 2NO2(g)
B
N2(g) + 3H2(g) &#8596; 2NH3(g)
C
CaCO3(s) &#8596; CaO(s) + CO2(g)
D
2N2H4(I) + N2O4(I) &#8596; 3N2(g) + 4H2O(I)
E
Q23
Fe(s) + Cu2+(aq) &#8594;Fe2+(aq) + Cu(s). From the reaction above, it can be inferred that
A
fe is the oxidizing agent
B
Fe is reduced
C
Cu2+ loses electrons
D
Cu2+ is the oxidizing agent
E
Q24
2.85 of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of
A
constant composition
B
conservation of mass
C
reciprocal proportions
D
multiple proportions
E
Q25
What is the oxidation number of Z in K3ZCl6?
A
-3
B
+3
C
-6
D
+6
E
Q26
2H2S(g) + SO2(g) + H2O(l) &#8594; 3S(s) + 3H2O(l)       ............... (I)3CuO(s) + 2NH3(g) &#8594; 3Cu(s) + 3H2O(l) + N2(g)     ...............(II)   In the equation above, the oxidizing agent (I) and the reducing agent (II) respectively are
A
H2S and NH3
B
SO2 and CuO
C
SO2 and NH3
D
H2S and CuO
E
Q27
Oxidation of concentrated hydrochloric acid with manganese (IV) oxide liberates a gas used in the
A
manufacture of tooth pastes
B
treatment of simple goitre
C
vulcanization of rubber
D
setelization of water
E
Q28
Cr2O72-(aq) + 14H+(aq) + 61-(aq) &#8594; 2Cr3+(aq) + 3I2(g) + 7H2O(I).   The change in the oxidation number of oxygen in the equation above is
A
0
B
1
C
2
D
7
E
Q29
H-(s) + H2O(I) &#8594; H2(g) + OH-(aq). Ffrom the equation above, it can be inferred that the
A
reaction is double decomposition
B
hybride ion is a reducing agent
C
hybride ion is an oxidizing agent
D
reaction is neutralization
E
Q30
MnO4(aq) + 8H+ (aq) &#8594; Mn2+(aq) + 5Fe3+(aq) + 4H2O(I).   The oxidation number of manganese in the above reaction changed from
A
+7 to +2
B
+6 to +2
C
+5 to +2
D
+4 to +2
E
Q31
The oxidation states of chlorine in HOCl, HCIO3 and HCIO4 are respectively
A
-1, +5 and +7
B
-1, -5 and 7
C
+1, +3 and +4
D
+1, +5 and +7
E
Q32
MnO2 + 2Cl- + 4H+ &#8594; Mn2+ + Cl2 + 2H2O The changes in oxidation numbers when the manganese chloride and hydrogen ions react according to the above equation are respectively
A
2, 2, 4
B
-1, -2, 4
C
-2, 1, 0
D
2, 4, 0
E
Q33
S2O32- + 12 &#8594; S4O6 + 21. In the reaction above the oxidizing agent is
A
S2O32-
B
12
C
S4O62-
D
1-
E
Q34
Which of the following is arranged in increasing electronegativity?
A
Chlorine, aluminium, magnesium, phosphorus, sodium
B
Sodium, magnesium, aluminium
C
Sodium, phosphorus, aluminium, magnesium
D
Sodium, chlorine, phosphorus, magnesium, aluminium
E
Q35
If a current of 105 A is passed for 4.00 hours through a molten tin salt and 13.3g of tin is deposited. What is the oxidation state of the metal in the salt?   [Sn = 118.7, F = 96500 C mol-1]
A
1
B
2
C
3
D
4
E
Q36
Cr2O72- + 6Fe2+ + 14H+ &#8594; 2Cr3+ + 6Fe3+ + 7H2O in the above equation , the oxidation number of chromium changed from
A
+7 to +3
B
+6 to +3
C
+5 to +3
D
-2 to +3
E
Q37
In the reaction 10-3 + 51- +6H+ &#8594; 312 + 3H2O. The oxidizing agent is
A
H+
B
1-
C
10-3
D
12
E
Q38
Fe2O3(s) + 2Al(s) &#8594; Al2O3 + 2Fe(s). If the heats of formation of Al2O and Fe2O3 are -1670 kJ mol-1 and -82kJ mol-1 respectivley, the enthalphy change in kJ for the reaction is
A
+2492
B
+848
C
-848
D
-2492
E
Q39
An element, Z forms an anion whose formula is [Z(CN)6]y. If Z has an oxidation number of 2+, what is the value of y?
A
-2
B
-3
C
-4
D
-5
E
Q40
The formula of the compound formed in a reaction between a trivalent metal M and a tetravalent non-metal X is
A
MX
B
M3X4
C
M4X3
D
M3X2
E
Q41
2.25 of sample of an oxide of copper on reduction gave 2.0 g of copper. 2.50 g of another oxide of copper on reduction also gave 2.0 g of copper. These results are in accordance with the law of
A
constant composition
B
conservation of matter
C
multiple proportions
D
definite proportions
E
Q42
Which of the following acts both as a reducing and an oxidizing agent?
A
H2
B
SO2
C
H2S
D
C
E
Q43
Complete oxidation of propan-1-01 gives
A
propanal
B
propan-2-al
C
propan-1-one
D
propanoic acid
E
Q44
In which of the following reactions does hydrogen peroxide act as a reducing agent?
A
H2S + H2O2 &#8594; S + 2H2O
B
PbSO3 + H2O2 &#8594; PbSO4 + H2O
C
21- + 2H+ + H2O2 &#8594; l2 + 2H2O
D
PbO3 + 2HNO3 + H2O2  &#8594; Pb(NO3)2 + 2H2O + O2
E
SO2 + H2O2 &#8594; H2SO4
Q45
An example of a neutral oxide is
A
Al2O3
B
NO2
C
CO2
D
CO
E
SO2
Q46
A gas that can behave as a reducing agent towards chloride and as an oxidizing agent towards hydrogen sylphide is
A
O2
B
NO
C
SO2
D
NH3
E
CO2
Q47
How many grams of methylacetylene (propyne) CH3 - C &#8801; CH completely discharge the colour of 8g of bromine?   (Br = 80, C = 12, H = 1)
A
0.5
B
1.0
C
2.0
D
3.0
E
4.0
Q48
Which of the following is NOT a redox reaction?
A
2HNO2 + 2Hl &#8594; 2H2O + 2NO + l2
B
Zn + H2SO4 &#8594; ZnSO4 + H2
C
Ca(HCO3)2 &#8594; CaCO3 + H2O + CO2
D
4FeO + O2 &#8594; 2Fe2O3
E
2Na + Cl2 &#8594; 2NaCl
Q49
An amphoteric oxide is an
A
amorphous oxide of metal
B
amorphous oxide of non-metal
C
oxide that is insoluble in water
D
oxide that behaves both as a base as well as an acid
E
oxide that loses its oxygen on sublimation
Q50
Which of the following equations represents an oxidizing  action of sulphur dioxide?
A
SO2 + 2HNO3 &#8594; H2SO4 + 2NO2 + heat
B
2SO2 +2H2O +O2 &#8594; 2H2SO4
C
SO2 + 2H2O + Cl2 &#8594; H2SO4 + 2HCl
D
SO2 + 2H2S &#8594; 3S + 2H2O
E
K2Cr2O7 + H2SO4 + 3SO2 &#8594; K2SO4 + Cr2(SO4)3 + H2O
Q51
The oxidation state of manganese is KMnO4 is
A
+1
B
+3
C
+5
D
+7
E
+2
Q52
Oxidation is the process of
A
gain of electrons
B
loss of electrons
C
gain of hydrogen
D
loss of oxygen
E
addition of an electropositive elements to a substance
Q53
In which of the following is the oxidation state of oxygen different from its value in water?
A
OH
B
H3O
C
CO
D
H2O2
E
SO2
Q54
The reaction of zinc with copper(II) ions in aqueous solution can be represented as follows; Cu2+(aq) + Zn(s) &#8594; Cu(s) + Zn2+ (aq). Which of the following is the most complete description of this reaction?
A
Copper (II) ions are being reduced
B
Zinc is being oxidized
C
Copper (II) ions and zinc are being reduced
D
Copper (II) ions and zinc are being oxidized
E
Copper (II) ions are being reduced and zinc oxidized
Q55
The oxidation state of manganese in potassium permanganate is
A
+7
B
+5
C
+3
D
+2
E
+1
Q56
Which of the following contains two atmospheric oxides?
A
Sodium oxide, Zinc oxide, Magnesium oxide
B
Aluminium oxide, Calcium oxide, Zinc oxide
C
Potassium oxide, Lithium oxide, Carbon dioxide
D
Silver oxide, Lead oxide, Sodium oxide
E
Sulphur oxide, Aluminium oxide, Carbon monoxide
Q57
Which one of these compounds will not give an oxygen gas on heating?
A
Manganese dioxide
B
Hydrogen peroxide
C
Zinc nitrate
D
Sodium nitrate
E
Ammonium nitrate
Q58
An anhydride is
A
a compound which has no water of crystalization
B
an oxide whose solution in water has a pH greater than seven
C
an oxide whose solution in water has a pH less than seven
D
an oxide that has hydrogen atoms
E
an ampoteric oxide
Q59
In the redox reaction 2Fe2+ = Cl2 &#8594; 2Fe3+ +2Cl
A
Cl2 is reduced because it has lost electrons
B
Cl2 is reduced because its oxidation number has decreased
C
Cl2 is reduced because its molecule is changed to two ions
D
Fe2+ is reduced because it has lost electrons
E
Fe2+ is reduced because it has gained electrons
Q60
In which of the following reactions is sulphur dioxide acting as an oxidizing agent?
A
SO2 + 2HNO3 &#8594; H2SO4 + NO3 + Heat
B
2SO2 + 2H2O +O2 &#8594; H2SO4
C
SO2 + 2H2O +Cl2 &#8594; H2SO4 + 2HCl
D
SO2 + 2H2S &#8594; 3S + 2H2O
E
SO2 + H2O &#8594; H2 SO4