Redox Reactions

The correct decreasing order of oxidation state of the \(\underline{\mathrm{underlined\, atom}}\) in each molecule is

In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with $\mathrm{KMnO}_4$ solution. If the volume of $\mathrm{KMnO}_4$ solution required to reach end point is 10 mL , the strength of the $\mathrm{KMnO}_4$ solution is

Consider the following compounds :
${\mathrm{\underline{K}O}}_2, \mathrm{H}_2 \underline{\mathrm{O}}_2$ and $\mathrm{H}_2 \underline{S }O_4$
The oxidation state of the underlined elements in them are, respectively,

The oxidation states not shown by Mn in given reaction is :
\(3 \mathrm{MnO}_4^{2-}+4 \mathrm{H}^{+} \longrightarrow 2 \mathrm{MnO}_4^{-}+\mathrm{MnO}_2+2 \mathrm{H}_2 \mathrm{O}\)
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate...

Which reaction is NOT a redox reaction?

The correct option for a redox couple is:

On balancing the given redox reaction,
$$\mathrm{aCr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{bSO}_{3}^{2-}(\mathrm{aq})+\mathrm{cH}^{+}(\mathrm{aq}) \rightarrow 2 \mathrm{aCr}^{3+}(\mathrm{aq})+\mathrm{bSO}_{4}^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{...

Which of the following reactions is a decomposition redox reaction?

What is the change in oxidation number of carbon in the following reaction?CH4(g) + 4Cl2(g) \(\to\) CCl4(l) + 4HCl(g)

Which of the following reactions are disproportionation reaction?
(a) 2Cu+ \(\to\) Cu2+
+ Cu0
(b) 3MnO42- + 4H+ \(\to\) 2MnO4- + MnO2 + 2H2O
(c) 2KMnO4 \(\buildrel \Delta \over \longrightarrow\) K2MnO4 + MnO2 + O2
(d) 2MnO4- + 3Mn2+...

The correct order of N-compounds in its
decreasing order of oxidation states is

For the redox reaction,
MnO4–
+ C2O4
2– + H+ \(\to\) Mn2+ + CO2
+ H2O
The correct coefficients of the reactants for
the balanced equation are

Hot concentrated sulphate acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour?

The pair of compounds that can exist together is

(I)   H2O2 + O3 \(\to\) H2O + 2O2
(II)   H2O2 + Ag2O \(\to\) 2Ag + H2O + O2
Role of Hydrogen peroxide in the above reactions is respectvely

In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (\(-\)O\(-\)O\(-\)) bonds. Oxidation state of Cr in CrO5 is

When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?

Oxidation numbers of P in PO\(_4^{3 - }\), of S in SO\(_4^{2 - }\) and that of Cr in Cr2O\(_7^{2 - }\) are respectively

Number of moles of MnO\(_4^{ - }\) required to oxidize one mole of ferrous oxalate completely in acidic medium will be

Which is the best description of the behaviour of bromine in the reaction given below?
H2O + Br2 \(\to\) HOBr + HBr

The oxidation states of sulphur in the anions
SO3\({_3^{2 - }}\), S2O\({_4^{2 - }}\) and S2O\({_6^{2 - }}\) follow the order