Q1
In terms of electron transfer, oxidation is defined as:
In terms of electron transfer, oxidation is defined as:
(A)
Loss of electrons
(B)
Gain of electrons
(C)
Gain of protons
(D)
Loss of protons
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Complete Syllabus Question Paper
Grade 11 : Chemistry - Redox Reactions (Set 2)— Questions & Detailed Solutions
Q2
What is the oxidation number of nitrogen in nitric acid ($HNO_3$)?
What is the oxidation number of nitrogen in nitric acid ($HNO_3$)?
(A)
+3
(B)
+4
(C)
+5
(D)
-3
Q3
Consider the reaction: $CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(l)$Which substance acts as the oxidizing agent in this reaction?
Consider the reaction: $CuO(s) + H_2(g) \rightarrow Cu(s) + H_2O(l)$
Which substance acts as the oxidizing agent in this reaction?
(A)
$H_2$
(B)
CuO
(C)
Cu
(D)
$H_2O$
Q4
What is the oxidation state of manganese (Mn) in potassium permanganate ($KMnO_4$)?
What is the oxidation state of manganese (Mn) in potassium permanganate ($KMnO_4$)?
(A)
+2
(B)
+4
(C)
+6
(D)
+7
Q5
Which of the following half-reactions represents a reduction process?
Which of the following half-reactions represents a reduction process?
(A)
$Fe^{2+} \rightarrow Fe^{3+} + e^-$
(B)
$Cl_2 + 2e^- \rightarrow 2Cl^-$
(C)
$Na \rightarrow Na^+ + e^-$
(D)
$2S^{2-} \rightarrow S_2 + 4e^-$
Q6
Calculate the oxidation number of chromium in potassium dichromate ($K_2Cr_2O_7$).
Calculate the oxidation number of chromium in potassium dichromate ($K_2Cr_2O_7$).
(A)
+6
(B)
+3
(C)
+5
(D)
+7
Q7
A redox reaction in which the same chemical species is simultaneously oxidized and reduced is termed a:
A redox reaction in which the same chemical species is simultaneously oxidized and reduced is termed a:
(A)
Combination reaction
(B)
Metal displacement reaction
(C)
Neutralization reaction
(D)
Disproportionation reaction
Q8
What is the oxidation state of oxygen in hydrogen peroxide ($H_2O_2$)?
What is the oxidation state of oxygen in hydrogen peroxide ($H_2O_2$)?
(A)
-2
(B)
-1
(C)
0
(D)
+2
Q9
Which of the following chemical reactions is NOT a redox reaction?
Which of the following chemical reactions is NOT a redox reaction?
(A)
$2Na(s) + Cl_2(g) \rightarrow 2NaCl(s)$
(B)
$AgNO_3(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_3(aq)$
(C)
$Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g)$
(D)
$CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(g)$
Q10
What is the oxidation state of sulfur in sulfuric acid ($H_2SO_4$)?
What is the oxidation state of sulfur in sulfuric acid ($H_2SO_4$)?
(A)
+2
(B)
+4
(C)
+6
(D)
-2
Q11
In an electrochemical cell, oxidation always occurs at the:
In an electrochemical cell, oxidation always occurs at the:
(A)
Anode
(B)
Cathode
(C)
Salt bridge
(D)
External voltmeter
Q12
Determine the oxidation number of carbon in methane ($CH_4$).
Determine the oxidation number of carbon in methane ($CH_4$).
(A)
+4
(B)
+2
(C)
-4
(D)
0
Q13
A reducing agent is defined as a chemical species that:
A reducing agent is defined as a chemical species that:
(A)
Gains electrons and undergoes reduction
(B)
Loses electrons and undergoes oxidation
(C)
Gains electrons and undergoes oxidation
(D)
Loses electrons and undergoes reduction
Q14
What is the average oxidation state of iron in magnetite ($Fe_3O_4$)?
What is the average oxidation state of iron in magnetite ($Fe_3O_4$)?
(A)
$+\frac{8}{3}$
(B)
+2
(C)
+3
(D)
$+\frac{3}{8}$
Q15
Consider the decomposition reaction: $2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2(g)$In this reaction, oxygen is:
Consider the decomposition reaction: $2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2(g)$
In this reaction, oxygen is:
(A)
Oxidized only
(B)
Reduced only
(C)
Both oxidized and reduced
(D)
Neither oxidized nor reduced
Q16
The standard electrode potential ($E^\circ$) of the Standard Hydrogen Electrode (SHE) is defined as:
The standard electrode potential ($E^\circ$) of the Standard Hydrogen Electrode (SHE) is defined as:
(A)
0.0 V
(B)
+1.0 V
(C)
-1.0 V
(D)
+0.5 V
Q17
What is the oxidation state of chlorine in perchloric acid ($HClO_4$)?
What is the oxidation state of chlorine in perchloric acid ($HClO_4$)?
(A)
+1
(B)
+3
(C)
+5
(D)
+7
Q18
Consider the equation: $CuSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Cu(s)$This reaction is classified as a:
Consider the equation: $CuSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Cu(s)$
This reaction is classified as a:
(A)
Non-metal displacement reaction
(B)
Metal displacement reaction
(C)
Acid-base neutralization reaction
(D)
Thermal decomposition reaction
Q19
What is the oxidation number of chlorine in elemental chlorine gas ($Cl_2$)?
What is the oxidation number of chlorine in elemental chlorine gas ($Cl_2$)?
(A)
0
(B)
-1
(C)
+1
(D)
+2
Q20
Consider the redox equation: $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$How many electrons are transferred per atom of zinc oxidized in this reaction?
Consider the redox equation: $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$
How many electrons are transferred per atom of zinc oxidized in this reaction?
(A)
1
(B)
2
(C)
3
(D)
4
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