Redox Reactions · Chemistry · KCET

In the reaction between moist $\mathrm{SO}_2$ and acidified permanganate solution.

The reducing agent in the given equations

$$4 \mathrm{Ag}(s)+8 \mathrm{CN}^{-}(a q)+2 \mathrm{H}_2 \mathrm{O}(a q)+\mathrm{O}_2(g) \longrightarrow 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+4 \mathrm{OH}^{-}(a q)$$

$$2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+\mathrm{Zn}(s) \longrightarrow {\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(a q)+2 \mathrm{Ag}(s)}$$

$$a \mathrm{MnO}_4^{-}+b \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \longrightarrow x \mathrm{MnO}_2 +y \mathrm{SO}_4^{2-}+z \mathrm{OH}^{-}$$

$$a$$ and $$y$$ respectively are

In which of the following compounds, an element exhibits two different oxidation states?

All Cu(II) halides are known, except the iodide, the reason for it is that

Which of the following is not true for oxidation?

How many moles of acidified $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ is required to liberate 6 moles of $$\mathrm{I}_2$$ from an aqueous solution of $$\mathrm{I}^{-}$$?

The oxidation number of nitrogen atoms in $$\mathrm{NH}_4 \mathrm{NO}_3$$ are

In which of the following cases a chemical reaction is possible?

The number of moles of electron required to reduce 0.2 mole of $$\mathrm{Cr}_2 \mathrm{O}_7^{-2}$$ to $$\mathrm{Cr}^{+3}$$ is

Which of the following statement is correct?

In the reaction of gold with aquaregia, oxidation state of nitrogen changes from

For the redox reaction

$$ \begin{aligned} x \mathrm{MnO}_4^{-}+y \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4+ & z \mathrm{H}^{+} \longrightarrow \\ & m \mathrm{Mn}^{2+}+n \mathrm{CO}_2+p \mathrm{H}_2 \mathrm{O} . \end{aligned} $$

The values of $x, y, m$ and $n$ are