Cr(2)O(7)^(2-) + I^(-) rarr I(2)+Cr^(3+)...

`Cr_(2)O_(7)^(2-) + I^(-) rarr I_(2)+Cr^(3+) E_(cell)^(@)=0.79V,E_(Cr_(2)O_(7)^(2-))^(@)=1.33V`. Then `E_(I_(2))^(@)=?`

0.54V

`-0.54V`

`+0.18V`

`-0.18V`

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Identify the reactions in which dichromate acts as an oxidising reagent . I . Cr_(2)O_(7)^(2)+6Fe^(2+)+14H^(+)rarr 2Cr^(3+) +6Fe^(3+)+7H_(2)O II. Cr_(2)O_(7)^(2-)+2OH^(-1) rarr2CrO_(4)^(2-)+H_(2)O III. Cr_(2)O_(7)^(2-)+6I+14H^(+)rarr 2Cr^(3+)+3I_(2)+7H_(2)O IV. Na_(2)Cr_(2)O_(7)+2KCI rarr K_(2)Cr_(2)O_(7)+2NaCI

Structure of Cr_(2)O_(7)^(2-) has

Calculate the potential of the half-cell containing 0.1 M K_(2)Cr_(2)O_(7(aq)), 0.2M Cr_((aq))^(3+)and 1.0xx10^(-4) M H_((aq))^(+). The half-reaction Cr_(2) O_(7(aq))^(2-)+ 14 H_((aq))^(+)+6e^(-)to 2 Cr_((aq))^(3+)+7H_(2)O_((l)) (E^(0) of Cr_(2)O_(7)^(2-) //Cr^(3+)=1.33V)

In the reaction the stoichiometry coefficients of Cr_(2)O_(7)^(2-) , NO_2^(-) and H^(+) respectively are Cr_(2)O_(7)^(2-) +NO_(2)^(-) +H^(+) rarr Cr^(3+) +NO_(3)^(-) +H_(2)O

In the reaction the stoichiometry coefficients of Cr_(2)O_(7)^(2-), NO_(2)^(-) and H^(+) respectively are Cr_(2)O_(7)^(2-)+NO_(2)^(-)+H^(+)rarrCr^(3+)+NO_(3)^(-)+H_(2)O

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. CrO_3 on reaction with HCl and the product on reaction with NaOH(aq) give respectively

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. Which of the following statements is wrong when a mixture of NaCI and K_2Cr_2O_2 is gently walmed with conc. H_2SO_4 ?

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. What happens when a solution of potassium chromate is treated with an excess of dilute nitric acid?

Calculate Delta G^(@) for the following cell reaction. Zn_((s)) + Ag_(2)O_((s)) + H_(2)O((I)) to Zn_(aq)^(2+) + 2Ag(s) + 2OH_((aq))^(-) E_((Ag^(+))/(Ag))^(@) =+0.80V and E_((Zn^(2+))/(Zn)) ^(@)=-0.76V

What is the mole coefficient of H_(2)SO_(4) in the balanced equation. K_(2)Cr_(2)O_(7) + FeSO_(4) + H_(2)SO_(4) rarr K_(2)SO_(4) + Fe_(2)(SO_(4))_(3) + Cr_(2)(SO_(4))_(3) + H_(2)O

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