Q1
According to classical and electronic concepts, what is oxidation defined as?
According to classical and electronic concepts, what is oxidation defined as?
(A)
Loss of electrons
(B)
Gain of electrons
(C)
Gain of hydrogen
(D)
Loss of oxygen
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Complete Syllabus Question Paper
Grade 11 : Chemistry - Redox Reactions (Set 1)— Questions & Detailed Solutions
Q2
What is the oxidation number of oxygen in elemental oxygen gas ($O_2$)?
What is the oxidation number of oxygen in elemental oxygen gas ($O_2$)?
(A)
-2
(B)
0
(C)
-1
(D)
+2
Q3
What is the oxidation state of sulfur ($S$) in sulfuric acid ($H_2SO_4$)?
What is the oxidation state of sulfur ($S$) in sulfuric acid ($H_2SO_4$)?
(A)
+2
(B)
+4
(C)
+6
(D)
-2
Q4
In the reaction $2Na(s) + Cl_2(g) \rightarrow 2NaCl(s)$, which reactant acts as the oxidizing agent?
In the reaction $2Na(s) + Cl_2(g) \rightarrow 2NaCl(s)$, which reactant acts as the oxidizing agent?
(A)
Na
(B)
$Cl_2$
(C)
NaCl
(D)
$Na^+$
Q5
What is the oxidation state of hydrogen in metal hydrides such as sodium hydride (NaH)?
What is the oxidation state of hydrogen in metal hydrides such as sodium hydride (NaH)?
(A)
-1
(B)
+1
(C)
0
(D)
+2
Q6
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
Q7
What is the oxidation state of chromium (Cr) in potassium dichromate ($K_2Cr_2O_7$)?
What is the oxidation state of chromium (Cr) in potassium dichromate ($K_2Cr_2O_7$)?
(A)
+3
(B)
+4
(C)
+6
(D)
+7
Q8
A reaction in which the same element simultaneously undergoes oxidation and reduction is called a:
A reaction in which the same element simultaneously undergoes oxidation and reduction is called a:
(A)
Disproportionation reaction
(B)
Displacement reaction
(C)
Combination reaction
(D)
Neutralization reaction
Q9
In an electrochemical cell, which process always occurs at the anode?
In an electrochemical cell, which process always occurs at the anode?
(A)
Reduction
(B)
Oxidation
(C)
Neutralization
(D)
Precipitation
Q10
In the reaction $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$, which species undergoes oxidation?
In the reaction $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$, which species undergoes oxidation?
(A)
$Zn(s)$
(B)
$Cu^{2+}(aq)$
(C)
$Zn^{2+}(aq)$
(D)
$Cu(s)$
Q11
What is the oxidation state of nitrogen ($N$) in nitric acid ($HNO_3$)?
What is the oxidation state of nitrogen ($N$) in nitric acid ($HNO_3$)?
(A)
+3
(B)
+4
(C)
+5
(D)
-3
Q12
What is the oxidation state of carbon ($C$) in carbon dioxide ($CO_2$)?
What is the oxidation state of carbon ($C$) in carbon dioxide ($CO_2$)?
(A)
+2
(B)
+4
(C)
-4
(D)
0
Q13
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)
+1
Q14
What is the algebraic sum of the oxidation numbers of all atoms in a neutral polyatomic molecule?
What is the algebraic sum of the oxidation numbers of all atoms in a neutral polyatomic molecule?
(A)
0
(B)
+1
(C)
-1
(D)
Variable
Q15
In an electrochemical cell, which process occurs at the cathode?
In an electrochemical cell, which process occurs at the cathode?
(A)
Oxidation
(B)
Hydrolysis
(C)
Reduction
(D)
Dehydration
Q16
What is the oxidation state of chlorine (Cl) in perchloric acid ($HClO_4$)?
What is the oxidation state of chlorine (Cl) in perchloric acid ($HClO_4$)?
(A)
+1
(B)
+3
(C)
+5
(D)
+7
Q17
In the displacement reaction $Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)$, which species acts as the reducing agent?
In the displacement reaction $Fe(s) + Cu^{2+}(aq) \rightarrow Fe^{2+}(aq) + Cu(s)$, which species acts as the reducing agent?
(A)
$Fe(s)$
(B)
$Cu^{2+}(aq)$
(C)
$Fe^{2+}(aq)$
(D)
$Cu(s)$
Q18
What is the oxidation number of iron (Fe) in hematite ($Fe_2O_3$)?
What is the oxidation number of iron (Fe) in hematite ($Fe_2O_3$)?
(A)
+2
(B)
+3
(C)
+4
(D)
+6
Q19
By international convention, what value is assigned to the standard reduction potential of the Standard Hydrogen Electrode (SHE)?
By international convention, what value is assigned to the standard reduction potential of the Standard Hydrogen Electrode (SHE)?
(A)
0.00 V
(B)
1.00 V
(C)
-1.00 V
(D)
+0.76 V
Q20
What is the oxidation state of phosphorus ($P$) in orthophosphoric acid ($H_3PO_4$)?
What is the oxidation state of phosphorus ($P$) in orthophosphoric acid ($H_3PO_4$)?
(A)
+3
(B)
+4
(C)
+5
(D)
-3
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