Home
Class 12
CHEMISTRY
Starch paper moistented with KI solution...

Starch paper moistented with `KI` solution turns blue in ozone because of____.

Text Solution

Verified by Experts

Chlorine placed below iodine in electrochemical series having more reduction potential and thus shows reduction whereas `I^(-)` undergoes oxidation. The `I_(2)` so formed get absorbed in starch to given bluw colour.
`2I^(-) rarr I_(2) +2e^(-)`
`(CI_(2)+2e^(-)rarr2CI^(-))/(CI_(2)+2I^(-)rarrI_(2)+2CI^(-))`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    ALLEN|Exercise MISCELLANEOUS SOLVED EXAMPLES|29 Videos

  • ELECTROCHEMISTRY

    ALLEN|Exercise COMPREHENSION TYPE|18 Videos

  • CHEMISTRY AT A GLANCE

    ALLEN|Exercise ORGANIC CHEMISTRY|472 Videos

  • HYDROCARBON

    ALLEN|Exercise MCQ|15 Videos

Similar Questions

Explore conceptually related problems

The solution in a beaker turns blue if

Why does a paper soaked in K_(2)Cr_(2)O_(7) solution turn green in the detection of SO_(3)^(2-) ion?

What happens when ozone reacts with KI solution?

A sodium salt (A) is heated with cone. Sulphuric acid. The evolved gas truns moist litmus paper red and producess white fumes in contact with a glass rod moistened with ammonia solution. It also gives white precipitate when passed through AgNO_(3) solution. When the salt is heated with MnO_(2) and cone. H_(2)SO_(4) , a gas with an irritating smell is evolved which turns starch-iodide paper blue. Identify the salt and the gaseous product evolved from it. Explain your answer with relevant chemical equations.

What will happen ?(Also write the chemical equations). (a)When a filter paper moistened with potassium iodate and starch solution is brought in contact with sulphur dioxide gas. (b)When H_(2)S gas is made to react with sodium tetrahydroxidoplumbate (II) solution.

The solution of blue vitrol in water is acidic because:

When a metal rod M is dipped into an aqueous colourless concetrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_3 dissolves O and gives an intense blue solution. Q. The final solution contains.

When a metal rod M is dipped into an aqueous colourless concetrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_3 dissolves O and gives an intense blue solution. Q. The compound N is

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

When a metal rod M is dipped into an aqueous colourless concetrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_3 dissolves O and gives an intense blue solution. Q. The metal rod M is Fe Cu Ni Co

ALLEN-ELECTROCHEMISTRY-EXERCISE -05 [B]
  1. Starch paper moistented with KI solution turns blue in ozone because o...

    Text Solution

    |

  2. Find the solubility product of a saturated solution of Ag(2)CrO(4) in ...

    Text Solution

    |

  3. Calculate the equilibrium constant for the reaction, 2Fe^(3+) + 3I^(-)...

    Text Solution

    |

  4. The gasX at 1 atm is bubbled through a solution containing a mixture o...

    Text Solution

    |

  5. The following electrochemical cell has been set up Pt(1)|Fe^(3+)|Fe^...

    Text Solution

    |

  6. Copper sulphate solution (250 ML) was electrolyzed using a platinum an...

    Text Solution

    |

  7. For the electrochemical cell, (M|M^(o+))||(X^(c-)|X),E^(c-).((M^(o+)|M...

    Text Solution

    |

  8. The standard potential of the following cell is 0.23V at 15^(@)C and 0...

    Text Solution

    |

  9. A standard solution of KNO(3) is used to make salt bridge, because

    Text Solution

    |

  10. The correct order of equivalent conductance at infinite dilution of ...

    Text Solution

    |

  11. The reaction 3ClO^(ө)(aq)rarrClO(3)^(-)(aq)+2Cl^(ө)(aq) is an exam...

    Text Solution

    |

  12. Complete the following chemical reaction equations : (i)MnO(4)^(...

    Text Solution

    |

  13. Two students use same stock solution of ZnSO(4) and a solution of CuSO...

    Text Solution

    |

  14. In an electrolytic cell, the flow of electrons is form

    Text Solution

    |

  15. Find the equilibrium constant of the following reaction Cu^(2+) (a...

    Text Solution

    |

  16. Zn|Zn^(2+)(a=0.1M)||Fe^(2+)(a=0.01M)Fe. The EMF of the above cell i...

    Text Solution

    |

  17. Calculate DeltaG(r)^(@) of the following reaction Ag^(+)(aq)+cI^(-)(...

    Text Solution

    |

  18. The rusting of iron takes place as follows : 2H^(o+)+2e^(-) +(1)/(2...

    Text Solution

    |

  19. We have taken a saturated solultion of AgBr, K(SP) is 12 xx 10^(-4). I...

    Text Solution

    |

  20. Tollen reagent is used for the detection of aldehydes. When a solution...

    Text Solution

    |

  21. Tollen reagent is used for the detection of aldehydes. When a solution...

    Text Solution

    |