Redox Reactions

Reaction of $\ce{PtF6}$ with oxygen $(\ce{O2})$ gas results in the formation of an ionic compound, $\mathbf X^+\mathbf Y^-$. Correct statement(s) is(are)

Which of the following sets includes all the species that will change the orange colour of $\ce{K2Cr2O7}$ in acidic medium ?

In order to oxidise a mixture of 1 mole each of $\ce{FeC2O4}$, $\ce{Fe2(C2O4)3}$, $\ce{FeSO4}$ and $\ce{Fe2(SO4)3}$ in acidic medium, the number of moles of $\ce{KMnO4}$ required is

Given below are two statements:

Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $\ce{SO2}$ is −2 and in $\ce{OF2}$ it is +2.

Statement II: The anomalous behaviour of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity.

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

Given below are two statements:

Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N.

Statement II: The oxidation state of oxygen in $\ce{OF2}$ is +2 and in $\ce{Na2O}$ is −2.

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

500 mL of 0.2 M $\ce{MnO4-}$ solution in basic medium when mixed with 500 mL of 1.5 M KI solution, oxidises iodide ions to liberate molecular iodine. This liberated iodine is then titrated with a standard $x$ M thiosulphate solution in presence of starch till the end point. If 300 mL of thiosulphate was consumed, then the value of $x$ is ________.

One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is

In an electrochemical cell, dichromate ions in aqueous acidic medium are reduced to $\ce{Cr^3+}$. The current (in amperes) that flows through the cell for 48.25 minutes to produce 1 mole of $\ce{Cr^3+}$ is _____.

Use: 1 Faraday $= 96500\ \mathrm{C\,mol^{-1}}$

The complete hydrolysis of $\ce{ICl}$, $\ce{ClF3}$ and $\ce{BrF5}$, respectively, gives

An electrochemical cell is fueled by the combustion of butane at 1 bar and 298 K. Its cell potential is $\dfrac{\boldsymbol{X}}{F}\times10^3$ volts, where $F$ is the Faraday constant. The value of $\boldsymbol{X}$ is _____.

Use: Standard Gibbs energies of formation at 298 K are: $\Delta_fG^\circ_{\ce{CO2}} = -394\ \mathrm{kJ\,mol^{-1}}$; $\Delta_fG^\circ_{\text{water}} = -237\ \mathrm{kJ\,mol^{-1}}$; $\Delta_fG^\circ_{\text{butane}} = -18\ \mathrm{kJ\,mol^{-1}}$

At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid ($\ce{HNO2}$) gives the species

In a metal deficient oxide sample, $\mathbf{M_XY_2O_4}$ (M and Y are metals), M is present in both +2 and +3 oxidation states and Y is in +3 oxidation state. If the fraction of $\mathbf{M^{2+}}$ ions present in M is $\dfrac13$, the value of X is _____.

An aqueous solution of hydrazine ($\ce{N2H4}$) is electrochemically oxidized by $\ce{O2}$, thereby releasing chemical energy in the form of electrical energy. One of the products generated from the electrochemical reaction is $\ce{N2(g)}$.

Choose the correct statement(s) about the above process

The number of moles of potassium iodide required to produce two moles of P is _____.

$\ce{H2S}$ (5 moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is $\mathbf x$, and the number of moles of electrons involved is $\mathbf y$. The value of $(\mathbf x + \mathbf y)$ is _____.

Consider the following molecules: $\ce{Br3O8}$, $\ce{F2O}$, $\ce{H2S4O6}$, $\ce{H2S5O6}$, and $\ce{C3O2}$.

Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is _____.

The treatment of an aqueous solution of 3.74 g of $\ce{Cu(NO3)2}$ with excess KI results in a brown solution along with the formation of a precipitate. Passing $\ce{H2S}$ through this brown solution gives another precipitate X. The amount of X (in g) is _____.

[Given: Atomic mass of H = 1, N = 14, O = 16, S = 32, K = 39, Cu = 63, I = 127]

Which one of the following elemental forms is not present in the enamel of the teeth ?

The difference in oxidation state of chromium in chromate and dichromate salts is ______.

Manganese (VI) has ability to disproportionate in acidic solution. The difference in oxidation states of two ions it forms in acidic solution is ______.