Q1
What is the oxidation state of chromium in chromium peroxide ($CrO_5$)?
What is the oxidation state of chromium in chromium peroxide ($CrO_5$)?
(A)
+10
(B)
+5
(C)
+6
(D)
+4
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Complete Syllabus Question Paper
Grade 11 : Chemistry - Redox Reactions (Set 3)— Questions & Detailed Solutions
Q2
Which of the following chemical reactions represents a disproportionation reaction?
Which of the following chemical reactions represents a disproportionation reaction?
(A)
$2KClO_3 \rightarrow 2KCl + 3O_2$
(B)
$P_4 + 3NaOH + 3H_2O \rightarrow PH_3 + 3NaH_2PO_2$
(C)
$Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$
(D)
$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$
Q3
In peroxodisulfuric acid ($H_2S_2O_8$), what is the oxidation state of sulfur?
In peroxodisulfuric acid ($H_2S_2O_8$), what is the oxidation state of sulfur?
(A)
+7
(B)
+8
(C)
+6
(D)
+4
Q4
When the redox reaction $MnO_4^- + Fe^{2+} + H^+ \rightarrow Mn^{2+} + Fe^{3+} + H_2O$ is balanced in acidic medium, what are the stoichiometric coefficients of $MnO_4^-$, $Fe^{2+}$, and $H^+$ respectively?
When the redox reaction $MnO_4^- + Fe^{2+} + H^+ \rightarrow Mn^{2+} + Fe^{3+} + H_2O$ is balanced in acidic medium, what are the stoichiometric coefficients of $MnO_4^-$, $Fe^{2+}$, and $H^+$ respectively?
(A)
1, 5, 8
(B)
2, 5, 16
(C)
1, 5, 4
(D)
5, 1, 8
Q5
Consider the reaction: $2H_2S + SO_2 \rightarrow 3S + 2H_2O$. Which species acts as the reducing agent?
Consider the reaction: $2H_2S + SO_2 \rightarrow 3S + 2H_2O$. Which species acts as the reducing agent?
(A)
$SO_2$
(B)
$H_2O$
(C)
$H_2S$
(D)
$S$
Q6
What is the $n$-factor (change in oxidation state per mole) of $KMnO_4$ when it acts as an oxidizing agent in a strongly alkaline medium?
What is the $n$-factor (change in oxidation state per mole) of $KMnO_4$ when it acts as an oxidizing agent in a strongly alkaline medium?
(A)
5
(B)
3
(C)
1
(D)
2
Q7
If the molar mass of potassium dichromate ($K_2Cr_2O_7$) is $M$, what is its equivalent weight in acidic medium?
If the molar mass of potassium dichromate ($K_2Cr_2O_7$) is $M$, what is its equivalent weight in acidic medium?
(A)
$M/3$
(B)
$M/6$
(C)
$M/5$
(D)
$M/2$
Q8
In the tetrathionate ion ($S_4O_6^{2-}$), what are the oxidation numbers of the two central sulfur atoms and the two terminal sulfur atoms, respectively?
In the tetrathionate ion ($S_4O_6^{2-}$), what are the oxidation numbers of the two central sulfur atoms and the two terminal sulfur atoms, respectively?
(A)
0 and +5
(B)
+2 and +3
(C)
+2.5 and +2.5
(D)
+1 and +4
Q9
Given standard reduction potentials $E^\circ(Zn^{2+}/Zn) = -0.76\text{ V}$ and $E^\circ(Cu^{2+}/Cu) = +0.34\text{ V}$, what is the standard cell potential ($E^\circ_{cell}$) for $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$?
Given standard reduction potentials $E^\circ(Zn^{2+}/Zn) = -0.76\text{ V}$ and $E^\circ(Cu^{2+}/Cu) = +0.34\text{ V}$, what is the standard cell potential ($E^\circ_{cell}$) for $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$?
(A)
+0.42 V
(B)
+1.10 V
(C)
-1.10 V
(D)
-0.42 V
Q10
What is the average oxidation number of iron in magnetite ($Fe_3O_4$)?
What is the average oxidation number of iron in magnetite ($Fe_3O_4$)?
(A)
+2
(B)
+3
(C)
$+8/3$
(D)
$+4/3$
Q11
In the disproportionation of chlorine in hot concentrated alkali: $3Cl_2 + 6OH^- \rightarrow 5Cl^- + ClO_3^- + 3H_2O$, how many total electrons are transferred in the balanced reaction per 3 moles of $Cl_2$?
In the disproportionation of chlorine in hot concentrated alkali: $3Cl_2 + 6OH^- \rightarrow 5Cl^- + ClO_3^- + 3H_2O$, how many total electrons are transferred in the balanced reaction per 3 moles of $Cl_2$?
(A)
3
(B)
5
(C)
6
(D)
10
Q12
Calculate the average oxidation state of carbon in glucose ($C_6H_{12}O_6$).
Calculate the average oxidation state of carbon in glucose ($C_6H_{12}O_6$).
(A)
+2
(B)
-2
(C)
0
(D)
+4
Q13
What volume of $0.02m KMnO_4$ solution is required to completely titrate 20 mL of $0.05m FeSO_4$ in acidic medium?
What volume of $0.02m KMnO_4$ solution is required to completely titrate 20 mL of $0.05m FeSO_4$ in acidic medium?
(A)
10 mL
(B)
20 mL
(C)
5 mL
(D)
50 mL
Q14
Which of the following chemical transformations is NOT a redox reaction?
Which of the following chemical transformations is NOT a redox reaction?
(A)
$BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + 2HCl$
(B)
$2Na + Cl_2 \rightarrow 2NaCl$
(C)
$2H_2O_2 \rightarrow 2H_2O + O_2$
(D)
$Fe + CuSO_4 \rightarrow FeSO_4 + Cu$
Q15
What are the oxidation states of the two nitrogen atoms in ammonium nitrate ($NH_4NO_3$)?
What are the oxidation states of the two nitrogen atoms in ammonium nitrate ($NH_4NO_3$)?
(A)
-3 and +5
(B)
-3 and +3
(C)
+3 and +5
(D)
0 and +5
Q16
Which of the following species can act ONLY as a reducing agent and NEVER as an oxidizing agent?
Which of the following species can act ONLY as a reducing agent and NEVER as an oxidizing agent?
(A)
$HNO_2$
(B)
$H_2O_2$
(C)
$S^{2-}$
(D)
$SO_2$
Q17
In the reaction $H_2O_2 + O_3 \rightarrow H_2O + 2O_2$, which species is oxidized and which is reduced?
In the reaction $H_2O_2 + O_3 \rightarrow H_2O + 2O_2$, which species is oxidized and which is reduced?
(A)
$H_2O_2$ is oxidized, $O_3$ is reduced
(B)
$H_2O_2$ is reduced, $O_3$ is oxidized
(C)
Both $H_2O_2$ and $O_3$ are oxidized
(D)
Neither species undergoes redox change
Q18
Calculate the equivalent mass of hydrated oxalic acid ($H_2C_2O_4 \cdot 2H_2O$, molar mass $= 126\text{ g/mol}$) when acting as a reducing agent.
Calculate the equivalent mass of hydrated oxalic acid ($H_2C_2O_4 \cdot 2H_2O$, molar mass $= 126\text{ g/mol}$) when acting as a reducing agent.
(A)
126 g/eq
(B)
63 g/eq
(C)
42 g/eq
(D)
31.5 g/eq
Q19
In which of the following compounds does sulfur exhibit an oxidation state of +4?
In which of the following compounds does sulfur exhibit an oxidation state of +4?
(A)
$SF_6$
(B)
$H_2SO_4$
(C)
$SO_2$
(D)
$Na_2S$
Q20
What are the oxidation states of chromium in dichromate ion ($Cr_2O_7^{2-}$) and chromate ion ($CrO_4^{2-}$)?
What are the oxidation states of chromium in dichromate ion ($Cr_2O_7^{2-}$) and chromate ion ($CrO_4^{2-}$)?
(A)
+6 in $Cr_2O_7^{2-}$ and +4 in $CrO_4^{2-}$
(B)
+6 in both species
(C)
+3 in $Cr_2O_7^{2-}$ and +6 in $CrO_4^{2-}$
(D)
+7 in $Cr_2O_7^{2-}$ and +6 in $CrO_4^{2-}$
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