Redox reactions practice · Medium

The reaction; $\mathrm{KI} + {\mathrm{I}_2} \to \mathrm{K}{\mathrm{I}_3}$ shows :

Assertion: $\mathrm{Cu}$ is stronger reducing agent than $\mathrm{H}_2$.

Reason: $\mathrm{E}^{\circ}$ of $\mathrm{Cu}^{2+} / \mathrm{Cu}$ is negative.

Oxidation numbers of Fe in$\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4}$ are :

The oxidation number of nitrogen in $\mathrm{N}{\mathrm{H}_2}\mathrm{OH}$ is :

Reaction of acidified $\mathrm{KMn}{\mathrm{O}_4}$ with ferrous oxalate gives oxidation products containing :

The most stable oxidation state of copper is :

$2 \mathrm{MnO}_4^{-}+10 \mathrm{I}^{-}+16 \mathrm{H}^{+} \rightarrow \mathrm{A}+8 \mathrm{H}_2 \mathrm{O}+\mathrm{B},$ A and B respectively are

Oxidation number of nitrogen is highest in

The number of moles of Mohr’s salt required per mole of dichromate ion is :

Which is not an oxidising agent?

Which combination is odd with respect to oxidation numbers of $\mathrm{S},\mathrm{Cr},\mathrm{N}$ and $\mathrm{H}$ respectively:

For the reaction: ${NH}_3+{OCl}^{-} \longrightarrow {N}_2 {H}_4+{Cl}^{-}$in basic medium, the coefficients of ${NH}_3, {OCl}^{-}$and ${N}_2 {H}_4$ for the balanced equation are respectively

$Fe{X_2}$ and $Fe{Y_3}$ are known when $x$ and $y$ are

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is:

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

The oxidation number of ‘ P ’ in $M{g_2}{P_2}{O_7}^{^{}}$ is

In which of the following compounds iron has lowest oxidation number?

Which of the following is disproportionation reaction?

What would happen when a small quantity of ${\mathrm{H}_2}{\mathrm{O}_2}$ is added to a solution of $\mathrm{FeS}{\mathrm{O}_4}$?

Which of the following reactions leads to the breakdown of a compound into two or more components?

Assertion (A): Addition of water to a solution containing solute and solvent cannot change it's normality or molarity.

Reason (R): The milliequivalent and millimoles of the solute are changed on dilution.

$\mathrm{MnO}_4^ -$ is a good oxidising agent in different medium changing to $\mathrm{MnO}_4^ - \to \mathrm{M}{\mathrm{n}^{2 + }}$,$\to \mathrm{MnO}_4^{2 - }, \to \mathrm{Mn}{\mathrm{O}_2}, \to \mathrm{M}{\mathrm{n}_2}{\mathrm{O}_3}$ Changes in oxidation number respectively are

The redox reaction among the following is

Assertion (A): Oxygen has oxidation state of -2 in both $\mathrm{O}_2$ and $\mathrm{O}_3.$

Reason (R): Oxygen is assigned an oxidation state of -2 in almost all its compounds.

Among $\mathrm{N}{\mathrm{H}_3},\mathrm{HN}{\mathrm{O}_{3,}}\mathrm{Na}{\mathrm{N}_3}$ and $\mathrm{M}{\mathrm{g}_3}{\mathrm{N}_2};$ the number of molecules having nitrogen in negative oxidation state is

Assertion: In alkaline medium, $\mathrm{KMnO}_4$ acts as powerful oxidising agent.
Reason: $\mathrm{KMnO}_4$ reduces to give $\mathrm{Mn}^{2+}$ in alkaline medium.

Identify the disproportionation reaction :

Which of the following is the cell reaction that occurs when the following half - cells are combined?

$\begin{aligned} & \mathrm{I}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{I}^{-}(1\,\mathrm{M}) ; \mathrm{E}^{\circ}=+0.54 \mathrm{~V} \\ & \mathrm{Br}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{Br}^{-}(1\,\mathrm{M}) ; \mathrm{E}^{\circ}=+1.09 \mathrm{~V} \end{aligned}$

The value of 'n' in the reaction $\mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - } + 14{\mathrm{H}^ + } + n\mathrm{F}{\mathrm{e}^{2 + }} \to 2\mathrm{C}{\mathrm{r}^{3 + }} + n\mathrm{F}{\mathrm{e}^{3 + }} + 7{\mathrm{H}^2}\mathrm{O}$ will be

Starch iodide paper is used to test for the presence of: