(B) The balanced redox reaction is:$8CrO_{4}^{2-} + 3S_{2}O_{3}^{2-} + 10H_{2}O \rightarrow 8Cr(OH)_{4}^{-} + 6SO_{4}^{2-} + 2OH^{-}$From the stoichio

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(B) The balanced redox reaction is:$8CrO_{4}^{2-} + 3S_{2}O_{3}^{2-} + 10H_{2}O \rightarrow 8Cr(OH)_{4}^{-} + 6SO_{4}^{2-} + 2OH^{-}$From the stoichiometry,the $n$-factor for $CrO_{4}^{2-}$ ($Cr^{+6}$ to $Cr^{+3}$) is $3$,and for $S_{2}O_{3}^{2-}$ ($S^{+2}$ to $S^{+6}$),the total change in oxidation state is $2 \times (6-2) = 8$.Using the law of equivalence: $n_{1}M_{1}V_{1} = n_{2}M_{2}V_{2}$$3 \times 0.154 \times V = 8 \times 0.25 \times 40$$0.462 \times V = 80$$V = \frac{80}{0.462} \approx 173.16 \ mL$Rounding to the nearest integer,we get $173 \ mL$.

Class 11 Chemistry Redox Reactions Mix Examples-Redox Reactions

Easy

In basic medium,$CrO_{4}^{2-}$ oxidises $S_{2}O_{3}^{2-}$ to form $SO_{4}^{2-}$ and itself changes into $Cr(OH)_{4}^{-}$. The volume of $0.154 \ M \ CrO_{4}^{2-}$ required to react with $40 \ mL$ of $0.25 \ M \ S_{2}O_{3}^{2-}$ is ........... $mL$ (Rounded-off to the nearest integer).

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A
$170$
B
$173$
C
$181$
D
$141$

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How much volume of $5 \ M$ $HNO_3$ is required to oxidize $16 \ g$ of $Fe^{+2}$ if $HNO_3$ is converted into $NO$? (Answer in $mL$)

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Which of the following changes does not occur when $K_2Cr_2O_7$ reacts with $H_2O_2$ solution?

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Match the following types of reactions in List-$I$ with their corresponding unbalanced equations in List-$II$.
List-$I$ (Type of reaction) List-$II$ (Unbalanced equation)
$A$. Combination reaction $(i)$ $AgNO_3 + CaCl_2 \longrightarrow AgCl + Ca(NO_3)_2$
$B$. Decomposition reaction $(ii)$ $Cl_2 \longrightarrow Cl^- + ClO_3^-$
$C$. Disproportionation reaction $(iii)$ $Mg + N_2 \longrightarrow Mg_3N_2$
$D$. Displacement reaction $(iv)$ $KClO_3 \xrightarrow{\Delta} KCl + O_2$

List-$I$ (Type of reaction)	List-$II$ (Unbalanced equation)
$A$. Combination reaction	$(i)$ $AgNO_3 + CaCl_2 \longrightarrow AgCl + Ca(NO_3)_2$
$B$. Decomposition reaction	$(ii)$ $Cl_2 \longrightarrow Cl^- + ClO_3^-$
$C$. Disproportionation reaction	$(iii)$ $Mg + N_2 \longrightarrow Mg_3N_2$
$D$. Displacement reaction	$(iv)$ $KClO_3 \xrightarrow{\Delta} KCl + O_2$

EasyAP EAMCET 2022

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Chlorine oxidises sulphur dioxide in the presence of water to give an oxyacid $A$. Chlorine also oxidises iodine in the presence of water to give an oxyacid $B$. The oxidation states of $S$ and $I$ in $A$ and $B$ are respectively

MediumAP EAMCET 2019

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In basic medium,$CrO_{4}^{2-}$ oxidises $S_{2}O_{3}^{2-}$ to form $SO_{4}^{2-}$ and itself changes into $Cr(OH)_{4}^{-}$. The volume of $0.154 \ M \ CrO_{4}^{2-}$ required to react with $40 \ mL$ of $0.25 \ M \ S_{2}O_{3}^{2-}$ is ........... $mL$ (Rounded-off to the nearest integer).

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How much volume of $5 \ M$ $HNO_3$ is required to oxidize $16 \ g$ of $Fe^{+2}$ if $HNO_3$ is converted into $NO$? (Answer in $mL$)

Acidified potassium permanganate solution is decolourised by

Which of the following changes does not occur when $K_2Cr_2O_7$ reacts with $H_2O_2$ solution?

Chlorine oxidises sulphur dioxide in the presence of water to give an oxyacid $A$. Chlorine also oxidises iodine in the presence of water to give an oxyacid $B$. The oxidation states of $S$ and $I$ in $A$ and $B$ are respectively

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