Some Important Compounds of Transition Metals

On oxidation of ${\mathrm{S}}_{\mathrm{2}}{\mathrm{O}}_3^{2-}$ by ${\mathrm{MnO}}_4^{-}$  in neutral aqueous medium, the oxidation number of S would change from:

The number of moles of ${\mathrm{KMnO}}_4$ that will be needed to react with one mole of sulphite ion in acidic solution is:

In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons. 

In the extraction process of copper, the product obtained after carrying out the reactions

$\text{ (i) }2{\mathrm{Cu}}_2 \mathrm{S}+3{\mathrm{O}}_2⟶2{\mathrm{Cu}}_2\mathrm{O}+2{\mathrm{SO}}_2$

$\text{ (ii) }2{\mathrm{Cu}}_2\mathrm{O}+{\mathrm{Cu}}_2 \mathrm{S}⟶6\mathrm{Cu}+{\mathrm{SO}}_2$ is called

Given below are two statements:

Statement I : Aqueous solution of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is preferred as a primary standard in volumetric analysis over ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ aqueous solution.

Statement II : ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ has a higher solubility in water than ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$. In the light of the above statements, choose the correct answer from the options given below:

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of $3$. Identify which of the below medium will favour the reaction.

Ferric chloride is applied to stop bleeding because

How many electrons are gained by ${{\mathrm{MnO}}_4}^{-}$ in strongly alkaline medium.

During bleeding from a cut ${\mathrm{FeCl}}_3$ is used to stop bleeding as:

Read the following two statements.
Statement I: Potassium dichromate is used in volumetric analysis.
Statement II: ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ is more soluble in water than ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$

Oxidation state of $\mathrm{Mn}$ in ${\mathrm{KMnO}}_4$ changes by three units in which medium ?

Explain oxidising nature of Potassium Permanganate in acidic medium?

The following steps are involved in the manufacturing of potassium dichromate:

What is the difference in the oxidation number of $\mathrm{Cr}$ between X and Y?

Which of the following reaction is spontaneous oxidation-reduction reaction?

When ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ crystals are heated with conc. $\mathrm{HCl}$, the gas evolved is

In the dichromate ion

Which of the following species has oxygen in $-1$ oxidation state?