Balancing Redox Reaction | Chemistry

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Balancing Redox Reaction

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Question 1
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Q. In the reaction Zn + H₂O --> ZnO₂ + H₂
which element, if any, is oxidized?
answer choices
Zinc
Hydrogen
Oxygen
None
Zinc
alternatives
Hydrogen
Oxygen
None
answer explanation
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Question 2
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Q. What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃
answer choices
Iron
Fluorine
Oxygen
Iron
alternatives
Fluorine
Oxygen
answer explanation
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Question 3
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Q. If in a reaction, copper is reduced; its number of electrons has:
answer choices
Increased
Decreased
Remained Constant
Varies Randomly
Increased
alternatives
Decreased
Remained Constant
Varies Randomly
answer explanation
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Question 4
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Q. If an atom loses electrons during a chemical reaction, the atom was:
answer choices
Oxidized
Reduced
Neutralized
Precipitated
Oxidized
alternatives
Reduced
Neutralized
Precipitated
answer explanation
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Question 5
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Q.
What element is being Reduced?
answer choices
N
H
O
S
N
alternatives
H
O
S
answer explanation
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Question 6
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Q. What is oxidation number of Cr in Cr₂O_7^2-?
answer choices
-2
+2
+6
+12
-2
alternatives
+2
+6
+12
answer explanation
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Question 7
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Q. What is oxidation number of O in O₂ ?
answer choices
0
-2
+1
+2
0
alternatives
-2
+1
+2
answer explanation
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Question 8
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Q.
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Balance the following ACIDIC reactions using changing oxidation number method.
MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s)

Water is a product of this reaction. What is the coefficient of water in the final balanced equation?
answer choices
8
5
2
16
8
alternatives
5
2
16
answer explanation
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Question 9
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Q.
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Balance the following reactions using changing oxidation number method.
MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s)
How many electrons water compound produced in the reaction?
answer choices
10
9
8
7
10
alternatives
9
8
7
answer explanation
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Question 10
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Q.
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:

Consider the following REDOX reaction:
Cl₂(g) → ClO⁻(aq) + Cl⁻(aq) (basic solution)
How many OH^- molecules did you add to the reactant side of this reaction when balancing?
answer choices
1
2
3
4
1
alternatives
2
3
4
answer explanation
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Question 11
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WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Consider the following REDOX reaction:
Cl₂(g) → ClO⁻(aq) + Cl⁻(aq) (basic solution)
Which species is the result of oxidation?
answer choices
Cl⁻
ClO⁻
Cl−
alternatives
ClO−
answer explanation
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Question 12
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Q.
What element is being Oxidized?
answer choices
N
H
O
S
N
alternatives
H
O
S
answer explanation
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Question 13
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Q.
What element is being Reduced?
answer choices
N
H
O
S
N
alternatives
H
O
S
answer explanation
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Question 14
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Q.
What are the coefficients when the equation is balanced?
answer choices
2 + 3 --> 2 + 3 + 4
1 + 3 --> 1 + 3 + 2
2 + 4 --> 2 + 3 + 2
1 + 1 --> 1 + 1 + 1
2 + 3 --> 2 + 3 + 4
alternatives
1 + 3 --> 1 + 3 + 2
2 + 4 --> 2 + 3 + 2
1 + 1 --> 1 + 1 + 1
answer explanation
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Question 15
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Q.
What element is being Oxidized?
answer choices
I
H
S
O
I
alternatives
H
S
O
answer explanation
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Question 16
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Q.
What are the coefficients when the equation is balanced?
answer choices
1 + 1 + 1 --> 2 + 1 + 3
2 + 2 + 2 --> 4 + 2 + 3
1 + 2 + 1 --> 2 + 2 + 3
1 + 1 + 1 --> 1 + 1 + 1
1 + 1 + 1 --> 2 + 1 + 3
alternatives
2 + 2 + 2 --> 4 + 2 + 3
1 + 2 + 1 --> 2 + 2 + 3
1 + 1 + 1 --> 1 + 1 + 1
answer explanation
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Question 17
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Q.
What element is being reduced?
answer choices
I
H
H
S
S
O
O
I
alternatives
HH
SS
OO
answer explanation
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Question 18
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Q. What is oxidation number of Cr in Cr₂O_7^2-?
answer choices
-2
+2
+6
+12
-2
alternatives
+2
+6
+12
answer explanation
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Question 19
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Q. What is oxidation number of H in CaH₂?
answer choices
+1
-1
0
+2
+1
alternatives
-1
0
+2
answer explanation
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Question 20
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Q. What is the oxidation number of N in NO_2^-1?
answer choices
-3
+4
-2
+3
-3
alternatives
+4
-2
+3
answer explanation
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