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To Ag(2)CrO(4) solution over its own per...

To `Ag_(2)CrO_(4)` solution over its own percipitate `CrO_(4)^(2-)` ions are added . This results in

A

increase in `Ag^(+)` concentration

B

decrease in `Ag^(+)` concentration

C

increase in solubiity product

D

Shifting of `Ag^(+) ` ions from the precipitate into the solution

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Verified by Experts

The correct Answer is:
B
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CrO_(4)^(-2),MnO_(4)^(-) ions are coloured due to

(A): K_(2)CrO_(4) has yellow colour due to charge transfer (R) : CrO_(4)^(2-) ion is tetrahedral in shape.

A metal salt solution forms a yellow/precipitate with K_(2)CrO_(4) in acetic a while precipitate with dil H_(2)SO_(4) but gives no preciptate with NaCI or Nal. The white precipitate obtained when Na_(2)CO_(3)

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. What happens when a solution of potassium chromate is treated with an excess of dilute nitric acid?

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 ?

To 50 ml. of 0.1 N Na_(2)CO_(3) solution 150 ml. of H_(2)O is added. Then calculate the normality of resultant solution.

AAKASH SERIES-IONIC EQUILLIBRIUM-LECTURE SHEET (EXERCISE-IV) ( Straight Objective Type Questions )
  1. Among the following statements a) If two salts have equal solubility...

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  2. The addition of NaCl to AgCI decreases the solubility of AgCl, because

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  3. To Ag(2)CrO(4) solution over its own percipitate CrO(4)^(2-) ions are ...

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  4. The solubility product of BaSO(4) at 18^(0) C is 1.5xx10^(-9) . It sol...

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  5. The solubility of CaF(2) is 2xx10^(-4) mole /litre . Its solubility pr...

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  6. If the solubility product of MOH is 1xx10^(-10) mol^(2).dm^(-2) . Then...

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  7. Which of the following is wrong ?

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  8. Ionisation of NH(4) OH is supressed by the addition of NH(4)CI because

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  9. The molar solubility in mol. lit^(-1) of a sparingly soluble salt MX(4...

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  10. Let the solubility of an aqueous solution of Mg(OH)(2), be "X^(@) then...

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  11. The correct representation for solubility product of SnS(2) , is

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  12. Which of the following has the lowest value of K at 25^(@) C?

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  13. Which of the following is most soluble ?

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  14. pH of saturated Mg(OH)(2), solution is 12, then

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  15. Which of the following is/are true for an acid- base titration?

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  16. Let the colour of the indicator (Hin colourles) will be visible only w...

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  17. The dissociation constant of an indicator 'InH' is 10^(5. Then

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  18. A solution which remains in equilibrium with undissolved solute is sai...

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  19. A solution which remains in equilibrium with undissolved solute is sai...

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  20. A solution which remains in equilibrium with undissolved solute is sai...

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