Redox reactions practice · Medium

Mass of oxygen obtained when 12.25 grams of $KCl{O_3}$ is heated is

Oxidation number of potassium in ${\mathrm{K}_\mathrm{2}}\mathrm{O},{\mathrm{K}_\mathrm{2}}{\mathrm{O}_\mathrm{2}}\,\,\,\mathrm{and}\,\,\,\mathrm{K}{\mathrm{O}_\mathrm{2}},$ respectively, is

Which is the reducing agent in the reaction,$8{\mathrm{H}^ + } + 4\mathrm{NO}_3^ - + 6\mathrm{C}{\mathrm{l}^ - } + \mathrm{Sn}\left( \mathrm{s} \right) \to \mathrm{SnCl}_6^{2 - } + 4\mathrm{N}{\mathrm{O}_2} + 4{\mathrm{H}_2}\mathrm{O}?$

In oxygen difluoride $\left(\mathrm{OF}_2\right)$ and dioxygen difluoride $\left(\mathrm{O}_2 \mathrm{~F}_2\right)$, the oxygen is assigned an oxidation number of

$\mathrm{KMn}{\mathrm{O}_4}$ in acid medium is always reduced to :

Which change requires a reducing agent?

The species that undergoes disproportionation in an alkaline medium are

Which of the following is redox reaction?

Which of the following species can function both as oxidizing as well as reducing agents?

The number of electrons lost or gained during the change $\mathrm{Fe} + {\mathrm{H}_2}\mathrm{O} \to \mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4} + {\mathrm{H}_2}$ is

The given reaction, $\mathrm{CuSO}_4+\mathrm{Zn} \longrightarrow \mathrm{Cu}+\mathrm{ZnSO}_4$ is an example of

Which is not a redox change?

If ${\mathrm{H}_2}\mathrm{S}$ is passed through an acidified ${\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}$solution, the colour of the solution :

In which of the following species O.N. per atom of the underlined elements is/are equal to +1?

The oxidation number that iron does not exhibit in its common compounds or in its elemental state is :

A good indicator must possess the following characteristics :

If rod of a metal (x) is put in a metal ion solution which is blue in colour, solution turn colourless. The metal rod and solution respectively are?

Given below the two statements:
Statement I: The ${E^\mathrm{o}}$ value for $C{e^{4 + }}/C{e^{3 + }}$ is + 1.74 V.
Statement II: $Ce$ is more stable in $C{e^{4 + }}$ state than $C{e^{3 + }}$ state.
In the light of the above statement, choose the correct answer from the options given below:

The value of n in$\mathrm{MnO}_4^ - + 8{\mathrm{H}^ + } + n{e^ - } \to \mathrm{M}{\mathrm{n}^{2 + }} + 4{\mathrm{H}_2}\mathrm{O}$ is

Assertion: Reaction of $\mathrm{SO}_2$ and $\mathrm{H}_2 \mathrm{S}$ in the presence of $\mathrm{Fe}_2 \mathrm{O}_3$ catalyst gives element sulphur.

Reason: $\mathrm{SO}_2$ is a reducing agent.

Assertion (A): $3 {ClO}^{-} \rightarrow {ClO}_3^{-}+2 Cl^{-}$ is an example of dissociation reaction.

Reason (R): ${ClO}^{-}$ gets oxidised as well as reduced.

The eq. wt. of $\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4}$ in , $\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4} + \mathrm{KMn}{\mathrm{O}_4} \to \mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3} + \mathrm{Mn}{\mathrm{O}_2}$ is:

Which is not a redox reaction?

How many electrons are involved in oxidation of $\mathrm{KMn}{\mathrm{O}_4}$ in basic medium?

Statement-I: In the reaction, $\frac{1}{2} \mathrm{O}_2+\mathrm{F}_2 \rightarrow \mathrm{OF}_2, \mathrm{~F}_2$ is oxidant.

Statement-II: Fluorine cannot show positive oxidation state.

When $\mathrm{KMn}{\mathrm{O}_4}$ as oxidising agent and ultimately forms $\mathrm{MnO}_4^{2 - }, \, {\text{MnO}}_{2}, \, \mathrm{M}{\mathrm{n}_2}{\mathrm{O}_3} \, \mathrm{and M}{\mathrm{n}^{2 + }},$ the number of electrons transferred per mole of $\mathrm{KMn}{\mathrm{O}_4}$ each case respectively is:

Which of the following is redox reaction

Assertion: $\mathrm{HNO}_2$ acts as reducing agent only.
Reason: $\mathrm{HNO}_2$ oxidises to $\mathrm{HNO}_3$ only but not reduce by any reducing agent.

Oxidation number of sodium in sodium amalgam is

Identify the set from the following sets in which all species can exhibit disproportionation reactions.