iCON Education - Redox Reactions AP-EAPCET Test

100 mL of aqueous solution of $0.05 \mathrm{M} \mathrm{Cu}^{2+}$ is added to 1 L of 0.1 M KI solution. The resultant solution was titrated with $0.01 \mathrm{M} \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ solution using starch indicator till blue colour disappeared. What is the volume (in mL ) of $\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ used?

Identify the correct statements about the following stoichiometric equation.

$ a \mathrm{P}_4+b^{-} \mathrm{OH}+c \mathrm{H}_2 \mathrm{O} \longrightarrow d \mathrm{PH}_3+e \mathrm{H}_2 \mathrm{PO}_2^{-} $

I. $a+b+c=5$

II. $b+c-e=3$

III. The oxidation state of P in $\mathrm{H}_2 \mathrm{PO}_2^{-}$is +l .

$\mathrm{KMnO}_4$ oxidises hydrogen sulphide in acidic medium, The number of moles of $\mathrm{KMnO}_4$ which react with one mole of hydrogen sulphide is

$\mathrm{H}_2 \mathrm{O}_2$ reduces $\mathrm{KMnO}_4$ in acidic medium to ' $x$ ' and in basic medium to ' $y$ '. What are $x$ and $y$ ?

$x=\mathrm{MnO}_2, y=\mathrm{Mn}^{2+}$

$x=\mathrm{Mn}^{2+}, y=\mathrm{MnO}_2$

$x=\mathrm{MnO}_4^{2-}, y=\mathrm{Mn}^{2+}$

$x=\mathrm{MnO}_2, y=\mathrm{MnO}_4^{2-}$

Which one of the following reactions is not feasible?

$\mathrm{Cl}_2(g)+2 \mathrm{KBr}(\mathrm{aq}) \longrightarrow 2 \mathrm{KCl}(g)+\mathrm{Br}_2(l)$

$\mathrm{Cl}_2(\mathrm{~g})+2 \mathrm{KI}(\mathrm{aq}) \longrightarrow 2 \mathrm{KCl}(\mathrm{aq})+\mathrm{I}_2(\mathrm{~s})$

$\mathrm{Br}_2(l)+2 \mathrm{KI}(\mathrm{aq}) \longrightarrow 2 \mathrm{KBr}(\mathrm{aq})+\mathrm{I}_2(\mathrm{~s})$

$\mathrm{I}_2(\mathrm{~s})+2 \mathrm{KBr}(\mathrm{aq}) \longrightarrow 2 \mathrm{KI}(\mathrm{aq})+\mathrm{Br}_2(\mathrm{l})$

Which one of the following acts as autocatalyst during titration of $\mathrm{KMnO}_4$ and oxalic acid in presence of dilute $\mathrm{H}_2 \mathrm{SO}_4$ ?

$\mathrm{H}_2 \mathrm{SO}_4$

$\mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$

$\mathrm{H}_2 \mathrm{O}_2$ with $\mathrm{KMnO}_4$ in acidic medium gives a manganese compound ' $X$ ' and in basic medium gives another manganese compound ' $Y$ '. The oxidation state of manganese in $X$ and $Y$ respectively are

The volume (in mL ) of 10 volume $\mathrm{H}_2 \mathrm{O}_2$ solution required to completely react with 200 mL of 0.4 M $\mathrm{KMnO}_4$ solution in acidic medium is

Observe the following reactions

(i) $2 \mathrm{KClO}_3(s) \xrightarrow{\Delta} 2 \mathrm{KCl}(s)+3 \mathrm{O}_2(g)$

(ii) $2 \mathrm{H}_2 \mathrm{O}_2(a q) \xrightarrow{\Delta} 2 \mathrm{H}_2 \mathrm{O}(l)+\mathrm{O}_2(g)$

(iii) $\mathrm{AgNO}_3(a q)+\mathrm{KCl}(a q) \longrightarrow \mathrm{AgCl}(s)+\mathrm{KNO}_3(a q)$

(iv) $2 \mathrm{Na}(s)+\frac{1}{2} \mathrm{O}_2(g) \longrightarrow \mathrm{Na}_2 \mathrm{O}(s)$

The number of redox reactions in thsi list is

Acidification of chromate gives ' $Z$ '. The oxidation state of chromium in ' $Z$ ' is

100 mL of $0.1 \mathrm{M} \mathrm{Fe}^{2+}$ solution was titrated with $\frac{1}{60} \mathrm{M}$ $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$ solution in acid medium. What is the volume (in L ) of $\mathrm{Cr}_2 \mathrm{O}_7^{2-}$ solution consumed ?

Which of the following reactions of $\mathrm{KMnO}_4$ occurs in acidic medium ?

Oxidation of thiosulphate to sulphate

Precipitation of sulphur from $\mathrm{H}_2 \mathrm{~S}$

Oxidation of iodide to iodate

Oxidation of manganous salt to $\mathrm{MnO}_2$

Which of the following occurs with $\mathrm{KMnO}_4$ in neutral medium?

Oxidation of oxalate ion

Precipitation of sulphur from hydrogen sulphide

Oxidation of $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+}$

Oxidation of iodide to iodate

In the reaction of sulphur with concentrated sulphuric acid, the oxidised product is $X$ and reduced product is $Y, X$ and $Y$ are respectively.

$\mathrm{SO}_3, \mathrm{SO}_2$

$\mathrm{SO}_2, \mathrm{SO}_2$

$\mathrm{SO}_2, \mathrm{H}_2 \mathrm{~S}$

$\mathrm{SO}_2, \mathrm{H}_2 \mathrm{O}$

Given below are two statements.

Statement I : In the decomposition of potassium chlorate Cl is reduced.

Statement II : Reaction of Na with $\mathrm{O}_2$ to form $\mathrm{Na}_2 \mathrm{O}$ is a redox reaction.

The correct answer is

Both statements I and II are correct.

Both statements I and II are not correct.

Statement I is correct but statement II is not correct.

Statement I is not correct but statement II is correct.

In neutral medium potassium permanganate oxidises $I^{-}$to $X$.. Identify the $X$.

What are the oxidation numbers of S atoms in $\mathrm{S}_4 \mathrm{O}_6^{2-}$ ?

How many grams of Mg is required to completely reduce $100 \mathrm{~mL}, 0.1 \mathrm{~M} \mathrm{~NO}_3^{-}$ solution using the following reaction?

$\mathrm{NO}_3^{-}+\mathrm{Mg} \longrightarrow \mathrm{Mg}^{2+}+\mathrm{NH}_3$

What is the oxidation state of S in the sulphur containing product of the following reaction?

$\mathrm{SO}_3^{2-}(a q)+\mathrm{Br}_2(l)+\mathrm{H}_2 \mathrm{O} \longrightarrow$

In the reaction of phosphorus with conc. $\mathrm{HNO}_3$, the oxidised and reduced products respectively are

$\mathrm{H}_3 \mathrm{PO}_4, \mathrm{NO}_2$

$\mathrm{H}_3 \mathrm{PO}_2, \mathrm{NO}$

$\mathrm{H}_3 \mathrm{PO}_3, \mathrm{~N}_2 \mathrm{O}$

$\mathrm{HPO}_3, \mathrm{NO}$

What are the oxidation states of three Br atoms in $\mathrm{Br}_3 \mathrm{O}_8$ molecule?

Which of the following statement is incorrect?

$\mathrm{T}^{3+}$ salts are oxidising agents.

$\mathrm{Ga}^{+}$ salts are reducing agents.

$\mathrm{Pb}^{4+}$ salts are better oxidising agents.

$\mathrm{As}^{+5}$ salts are better oxidising agents.

Which among the following species does not show disproportionation reaction?

$\mathrm{ClO}_2^{-}$

$\mathrm{ClO}_3^{-}$

$\mathrm{ClO}_4^{-}$

For the redox reaction

$\mathrm{MnO}_4^{-}+\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$,

the correct coefficients of the reactants for the balanced reaction are respectively

Assertion (A) The colour of old lead paintings can be restored by washing them with a dilute solution of $\mathrm{H}_2 \mathrm{O}_2$.

Reason (R) Hydrogen peroxide reduces $\mathrm{PbS}$ to $\mathrm{Pb}$.

Both $A$ and $R$ are true and $R$ is a correct explanation for $A$.

Both $A$ and $R$ are true but $R$ is not a correct explanation for $A$.

$A$ is true but $R$ is false.

$A$ is false but $R$ is true.

Which among the following species acts as a self-indicator?