Redox Reactions

Which one of the following is an example of disproportionation reaction ?

Heating white phosphorus with conc. NaOH solution gives mainly :

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is ______ B.M. (Nearest Integer)

BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of Be in [A] is ______.

A 2.0 g sample containing $\mathrm{MnO_2}$ is treated with HCl liberating $\mathrm{Cl_2}$. The $\mathrm{Cl_2}$ gas is passed into a solution of KI and 60.0 mL of 0.1 M $\mathrm{Na_2S_2O_3}$ is required to titrate the liberated iodine. The percentage of $\mathrm{MnO_2}$ in the sample is ______. (Nearest integer)

[Atomic masses (in u) Mn = 55; Cl = 35.5; O = 16, I = 127, Na = 23, K = 39, S = 32]

Which of the following oxoacids of sulphur contains "S" in two different oxidation states ?

0.01 M $\mathrm{KMnO_4}$ solution was added to 20.0 mL of 0.05 M Mohr's salt solution through a burette. The initial reading of 50 mL burette is zero. The volume of $\mathrm{KMnO_4}$ solution left in the burette after the end point is ______ mL. (nearest integer)

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium ?

The reaction of $\mathrm{H_2O_2}$ with potassium permanganate in acidic medium leads to the formation of mainly :

Which of the given reactions is not an example of disproportionation reaction ?

The dark purple colour of $\mathrm{KMnO_4}$ disappears in the titration with oxalic acid in acidic medium. The overall change in the oxidation number of manganese in the reaction is :

The amount of charge in F (Faraday) required to obtain one mole of iron from $\mathrm{Fe_3O_4}$ is ______. (Nearest Integer)

20 mL of 0.02 M hypo solution is used for the titration of 10 mL of copper sulphate solution, in the presence of excess of KI using starch as an indicator. The molarity of $\mathrm{Cu^{2+}}$ is found to be ______ $\times10^{-2}$ M. [nearest integer]

Given : $\mathrm{2Cu^{2+}+4I^-\rightarrow Cu_2I_2+I_2}$

$\mathrm{I_2+2S_2O_3^{2-}\rightarrow2I^-+S_4O_6^{2-}}$

Given below are two statements.

Statement I: Iron (III) catalyst, acidified $\mathrm{K_2Cr_2O_7}$ and neutral $\mathrm{KMnO_4}$ have the ability to oxidise $\mathrm{I^-}$ to $\mathrm{I_2}$ independently.

Statement II: Manganate ion is paramagnetic in nature and involves $p\pi-p\pi$ bonding.

In the light of the above statements, choose the correct answer from the options given below.

20 mL of 0.02 M $\mathrm{K_2Cr_2O_7}$ solution is used for the titration of 10 mL of $\mathrm{Fe^{2+}}$ solution in the acidic medium.

The molarity of $\mathrm{Fe^{2+}}$ solution is ______ $\times10^{-2}$ M. (Nearest Integer)

In the titration of $\mathrm{KMnO_4}$ and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is ______

In neutral or alkaline solution, $\mathrm{MnO_4^-}$ oxidises thiosulphate to :

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : Permanganate titrations are not performed in presence of hydrochloric acid.

Reason R : Chlorine is formed as a consequence of oxidation of hydrochloric acid.

In the light of the above statements, choose the correct answer from the options given below

On reaction with stronger oxidizing agent like $\mathrm{KIO_4}$, hydrogen peroxide oxidizes with the evolution of $\mathrm{O_2}$. The oxidation number of I in $\mathrm{KIO_4}$ changes to ______.

In neutral or faintly alkaline medium, $\mathrm{KMnO_4}$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :