Redox Reactions

The correct statement(s) related to oxoacids of phosphorous is(are)

The value of $\mathbf x$ is ____.

The value of $\mathbf y$ is ____.

Ozonolysis of $\ce{ClO2}$ produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is ____.

(A) $\mathrm{HOCl+H_2O_2\to H_3O^++Cl^-+O_2}$

(B) $\mathrm{I_2+H_2O_2+2OH^-\to2I^-+2H_2O+O_2}$

Choose the correct option.

The reaction of sulphur in alkaline medium is given below :

$\mathrm{S_{8(s)}+a\,OH^-_{(aq)}\to b\,S^{2-}_{(aq)}+c\,S_2O_3^{2-}{}_{(aq)}+d\,H_2O_{(l)}}$

The values of 'a' is _______. (Integer answer)

In the chemical reaction between stoichiometric quantities of $\ce{KMnO4}$ and KI in weakly basic solution, what is the number of moles of $\ce{I2}$ released for 4 moles of $\ce{KMnO4}$ consumed?

Choose the correct statement(s) among the following.

Fusion of $\ce{MnO2}$ with KOH in presence of $\ce{O2}$ produces a salt W. Alkaline solution of W upon electrolytic oxidation yields another salt X. The manganese containing ions present in W and X, respectively, are Y and Z. Correct statement(s) is(are)

With reference to aqua regia, choose the correct option(s)

The amount of water produced (in g) in the oxidation of 1 mole of rhombic sulphur by conc. $\ce{HNO3}$ to a compound with the highest oxidation state of sulphur is ______

(Given data: Molar mass of water = 18 g mol⁻¹)

To measure the quantity of $\mathrm{MnCl_2}$ dissolved in an aqueous solution, it was completely converted to $\mathrm{KMnO_4}$ using the reaction,

$$\mathrm{MnCl_2 + K_2S_2O_8 + H_2O \rightarrow KMnO_4 + H_2SO_4 + HCl} \quad \text{(equation not balanced)}.$$

Few drops of concentrated HCl were added to this solution and gently warmed. Further, oxalic acid (225 mg) was added in portions till the colour of the permanganate ion disappeared. The quantity of $\mathrm{MnCl_2}$ (in mg) present in the initial solution is ____.

(Atomic weights in g mol$^{-1}$: Mn = 55, Cl = 35.5)

The order of the oxidation state of the phosphorus atom in $\ce{H3PO2}$, $\ce{H3PO4}$, $\ce{H3PO3}$, and $\ce{H4P2O6}$ is

Which of the following reactions is an example of a redox reaction ?

The pair of compounds having metals in their highest oxidation state is :

In which of the following reactions, hydrogen peroxide acts as an oxidizing agent ?

The number of P−OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid ($\ce{H4P2O7}$) respectively are :

In neutral or faintly alkaline solution, 8 moles of permanganate anion quantitatively oxidize thiosulphate anions to produce X moles of a sulphur containing product. The magnitude of X is

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :

The pair in which phosphorous atoms have a formal oxidation state of +3 is :