Home
Class 12
CHEMISTRY
A solution of Cr(NO3)3 slowly turns gree...

A solution of `Cr(NO_3)_3` slowly turns green when cone. HCl is added due to the formation of

A

`Cr^(3+)`

B

`Cr(OH)_3`

C

`CrCl_3`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
(c

`Cr(NO_3) ` reacts with conc HCl to form `CrCl_3` which makes the soltuion green
`CrCr(NO_3)_3+ HCl to CrCl_3`
Promotional Banner

Topper's Solved these Questions

  • CLASSIFICATION OF ELEMENTS AND PERIODIC PROPORTIES

    SIA PUBLICATION|Exercise MCQ|38 Videos
  • EAMCET - 2018 (TS) SHIFT - 1

    SIA PUBLICATION|Exercise EXERCISE - Chemistry|32 Videos

Similar Questions

Explore conceptually related problems

Acidified K_2Cr_2O_7 solution turns green when Na_2SO_3 is added to it. This is due to the formation of

AIF_(3) is soluble in HF only in presence of KF . It is due to the formation of

Acidified dichromate solution turns green when sodium sulphide is added to it. Explain.

A solution on treatment with NH_(3) turns blue, contains

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 ?

White fumes appear around the bottle of anhyd. AICI_3 due to the formation of

SIA PUBLICATION-d AND f BLOCK ELEMENTS-MCQ"s
  1. When AbNO3 solution is added in excess to 1M solution of CoC13c c NH3 ...

    Text Solution

    |

  2. Hg stick to the surface of the glass , When it comes in contact with

    Text Solution

    |

  3. The element that can exhibit highest number of oxidation state amongst...

    Text Solution

    |

  4. The number of moles of AgCl precipitated when excess AgNO3 is mixed on...

    Text Solution

    |

  5. The metal that forms a self protecting film of oxide to prevent corros...

    Text Solution

    |

  6. An example of a non - transitional element is

    Text Solution

    |

  7. The ion that is likely to be colourless in aqueous solution, is

    Text Solution

    |

  8. The oxidation state of Mo in (MO2Cl8)^(4-) ion is

    Text Solution

    |

  9. When the same amount of zinc is treated with excess if H2SO4 and with ...

    Text Solution

    |

  10. The reagent used for concentrating silver ore , is

    Text Solution

    |

  11. Which of the following alloys contains Cu and Zn ?

    Text Solution

    |

  12. The 4 F level is successively filled up in

    Text Solution

    |

  13. Silver is extracted from its

    Text Solution

    |

  14. Oxides of iron in the blast furnace get reduced due to the action of …...

    Text Solution

    |

  15. The paramagnetic character of transition metals is due to the presence...

    Text Solution

    |

  16. Transition element exhibit variable valency on account of …… d- orbita...

    Text Solution

    |

  17. Inner transition element exhibit different coloured compound on accoun...

    Text Solution

    |

  18. A solution of Cr(NO3)3 slowly turns green when cone. HCl is added due ...

    Text Solution

    |

  19. Cuprous ion is colourless while cupric ion is coloured because

    Text Solution

    |

  20. In the reaction , (C2O4^2 +MnO4^- + H^+ ) to (H2O + Mn^2+ ) + Co2, the...

    Text Solution

    |