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- 1. Multiple ChoiceOxygen always has an oxidation number of...-112-2
- 2. Multiple ChoiceIs calcium oxidized or reduced in the following reaction?
2CaO--> 2Ca + O2OxidizedReduced - 3. Multiple ChoiceIn the reaction Zn + H2O --> ZnO2 + H2
which element, if any, is oxidized?ZincHydrogenOxygenNone - 4. Multiple ChoiceAnother name for a "oxidation-reduction" reaction ischemical reactionneutralization reactionredox reactionnuclear reaction
- 5. Multiple ChoiceWhat substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3IronFluorineOxygen - 6. Multiple ChoiceIf an atom loses electrons during a chemical reaction, the atom was:OxidizedReducedNeutralizedPrecipitated
- 7. Multiple Choice
What element is being Oxidized?NHOS - 8. Multiple ChoiceWhat element is being Reduced?NHOS
- 9. Multiple ChoiceWhat are the coefficients when the equation is balanced?2 + 3 --> 2 + 3 + 41 + 3 --> 1 + 3 + 22 + 4 --> 2 + 3 + 21 + 1 --> 1 + 1 + 1
- 10. Multiple ChoiceWhat element is being Oxidized?IHSO
- 11. Multiple ChoiceWhat are the coefficients when the equation is balanced?1 + 1 + 1 --> 2 + 1 + 32 + 2 + 2 --> 4 + 2 + 31 + 2 + 1 --> 2 + 2 + 31 + 1 + 1 --> 1 + 1 + 1
- 12. Multiple ChoiceWhat is the oxidation number of N in NO2-1?-3+4-2+3
- 13. Multiple ChoiceWhat is oxidation number of H in H2O?0-2-1+1
- 14. Multiple ChoiceWhat is oxidation number of Cr in Cr2O72-?-2+2+6+12
- 15. Multiple ChoiceWhat is oxidation number of H in CaH2?+1-10+2
- 16. Multiple ChoiceWhat is oxidation number of Fe in FeO ?+2-20+1
- 17. Multiple ChoiceWhat is oxidation number of O in O2 ?0-2+1+2
- 18. Multiple Choice
Which of following is incorrect about oxidation?
Addition of oxygen
Loss of electron
Increase in oxidation state
Addition of electopositive element
- 19. Multiple Choice
The reduction process involves
Increase in oxidation number
Decrease in oxidation number
No change in oxidation number
Sometimes increase and sometimes decrease in oxidation number
- 20. Multiple Choice
Which of the following represents a redox reaction?
(a) NaOH + HCl → NaCl + H2O
(b) BaCl2 + H2SO4 → BaSO4 + 2HCl
(c) CuSO4 + 2H2O → Cu(OH)2 + H2SO3
(d) Zn + 2HCl → ZnCl2 + H2
- 21. Multiple Choice
Which of following is correct about given reaction:-
Cl2 + H2S → S + 2HCl
Cl2 is oxidising agent in the reaction.
Cl2 undergo oxidation.
H2S is oxidising agent.
H2S undergo reduction
- 22. Multiple Choice
What is oxidation state of chlorine in Cl2 molecule ?
-1
1
-2
0
- 23. Multiple Choice
What is oxidation state of Sulphur in H2SO4 ?
+6
-6
+4
-4
- 24. Multiple Choice
Which oxidation state shown by alkali metals?
-1
+2
-2
+1
- 25. Multiple Choice
Which of following is incorrect about oxidation state?
Oxidation state of all elements in their elemental form is taken as zero.
For ions composed of only one atom, theoxidation number is equal to the chargeon the
The algebraic sum of the oxidation numberof all the atoms in a compound must bezero.
In metal hydrides oxidation state of Hydrogen is +1.
- 26. Multiple Choice
Oxidation state shown by alkaline earth metal is
1
2
-1
-2
- 27. Multiple Choice
What is oxidation state of oxygen in ozone (O3) molecule ?
-2
-1/2
0
-1
- 28. Multiple Choice
What is the oxidation number of chlorine in HClO?
0
-1
+1
+5
- 29. Multiple Choice
Oxidation is the _________ of electrons.
loss
gain
sharing
transfer
- 30. Multiple Choice
Reduction is the ___________ of electrons.
loss
gain
sharing
transfer
- 31. Multiple Choice
What is the oxidation number of nitrogen in N2?
-3
0
+4
-1
- 32. Multiple Choice
The sum of the oxidation numbers in SCN- is equivalent to
0
-1
+1
+3
- 33. Multiple Choice
The sum of the oxidation numbers in Na2CO3 is equivalent to
0
-2
+1
-1
- 34. Multiple Choice
Which of the following represents oxidation?
C → CH4
Fe3+ → Fe2+
Cl2 → 2Cl-
Zn → ZnO
- 35. Multiple ChoiceWhich of the following represents reduction?C → CON2 → NH3Zn → Zn2+H2 → H2O
- 36. Multiple Choice
In the reaction Zn + 2HCl --> ZnCl2 + H2
which element, if any, is oxidized?
Zinc
Hydrogen
Chlorine
None
- 37. Multiple ChoiceIn the reaction
2Ca(s) + O2(g) --> 2CaO(s), calcium is __________ReducedSynthesizedOxidizedNone of the above - 38. Multiple ChoiceWhich statement is true:
Mg → Mg2+ + 2e–Mg gains 2 electronsMg2+ loses 2 electronsMg loses 1 electronMg loses 2 electrons - 39. Multiple ChoiceIf in a reaction, copper is reduced; its number of electrons has:IncreasedDecreasedRemained ConstantVaries Randomly
- 40. Multiple ChoiceWhat is oxidation number of O in O2 ?0-2+1+2
- 41. Multiple Choice
If an atom is reduced in a redox reaction, what must happen to another atom in the system?
It must be oxidised.
It must be reduced.
It must be neutralised.
Nothing needs to happen to another atom in the system.
- 42. Multiple Choice
If an atom is reduced in a redox reaction, what must happen to another atom in the system?
It must be oxidised.
It must be reduced.
It must be neutralised.
Nothing needs to happen to another atom in the system.
- 43. Multiple Choice
Which type of reaction is the conversion of iron oxide to iron and oxygen?
oxidation
reduction
neutralisation
combination
- 44. Multiple Choice
Which type of reaction is the conversion of iron oxide to iron and oxygen?
oxidation
reduction
neutralisation
combination
- 45. Multiple Choice
What change occurs during oxidation?
gain of hydrogen
loss of oxygen
gain of elections
loss of electrons
- 46. Multiple ChoiceWhat substance is oxidized in the following reaction?
4Fe + 3O2 --> 2Fe2O3IronFluorineOxygen - 47. Multiple Choice
Substance that oxidizes another substance by accepting its electrons.
reducing agent
oxidation number
combustion
oxidizing agent
- 48. Multiple Choice
Substance that oxidizes another substance by accepting its electrons.
reducing agent
oxidation number
combustion
oxidizing agent
- 49. Multiple Choice
Substance that reduces another substance by losing electrons.
reducing agent
half-reaction
electronegative atom
oxidizing agent
- 50. Multiple Choice
A redox reaction is NOT:
all reactions
a combustion reaction
a reduction-oxidation reaction
a reaction in which electrons are transferred from one atom to another
- 51. Multiple Choice
Which statement is true of a reducing agent?
It is oxidised as it gains electrons.
It is oxidised as it loses electrons.
It is reduced as it gains electrons.
It is reduced as it loses electrons.
- 52. Multiple Choice
What is the substance that loses hydrogen in a redox reaction?
oxidizing agent
reducing agent
is reduced
decreases in oxidation number
- 53. Multiple Choice
What is the substance that loses oxygen in a redox reaction?
oxidizing agent
reducing agent
is oxidized
increases in oxidation number
- 54. Multiple Choice
When a gas changes iron(III) oxide to iron(II) oxide, the gas is
a combustible gas
a reducing agent
an inert gas
an oxidising agent
- 55. Multiple Choice
What is the colour change of acidified KMnO4(aq) solution as a test for reducing agents?
From green to orange
From orange to green
From purple to colourless
From colourless to purple
- 56. Multiple Choice
In a redox reaction, spectator ions...
become oxidised
become reduced
remain unchanged
- 57. Multiple Choice
Which gas is the strongest reducing agent?
Br-
Cl-
F-
I-
- 58. Multiple Choice
What is the oxidizing agent of this reaction?
3Mg + N2 → Mg3N2
Mg
N2
Mg3N2
MgN
- 59. Multiple Choice
What is the reducing agent of this reaction?
2Al (s) + 6H+ (aq) → 2Al3+ (aq) + 3H2 (g)
H+
Al3+
Al
H2
- 60. Multiple Choice
For the following example, identify the reducing agent:
H2 + Cl2 --> 2HCl
H2
Cl2
Both
- 61. Multiple Choice
Substances that lose electrons easily and are oxidized in a chemical reaction are ____________.
reducing agents
coloring agents
oxidizing agents
neutralizing agents
analytical agents
- 62. Multiple Choice
Of the following, which would most likely be an oxidizing agent?
K
Ag+
Cl2
- 63. Multiple Choice
Of the following, which would most likely be a reducing agent?
Ag+
Cl2
K
- 64. Multiple Choice
For the following example, identify the reducing agent: Al+3 + P-3 --> AlP
Al+3
P-3
Both
- 65. Multiple Choice
What is the reducing agent of this reaction?
2Al(s) + 6H+(aq) −−−> 2Al3+ (aq) + 3H2(g)
H+
Al3+
Al
H2
- 66. Multiple ChoiceWhat is the oxidizing agent of this reaction?
Cr2O72-(aq) + 8H+(aq) + 3H2S(aq) −−−> 2Cr3+(aq) + 7H2O(l) + 3S(s)Cr2O72-H2SCr3+S - 67. Multiple Choice
What is the oxidation number of O in elemental O2 ?
0
-2
+1
+2
- 68. Multiple ChoiceWhat is the oxidation number of H in CH4?-1+1-4+4
- 69. Multiple Choice
Which species undergoes a gain of electrons?
Zn(s) + Mg2+(aq) −−−> Zn2+(aq) + Mg (s)
Zn
Mg2+
Zn2+
Mg
- 70. Multiple Choice
Which species undergoes a loss of electrons?
Fe(s) + Cl2(g)−−−>Fe2+(aq) + Cl- (aq)
Fe
Fe2+
Cl2
Cl-
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