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Salt +H(2)SO(4) (dilute) to Coloured vap...

Salt +`H_(2)SO_(4)` (dilute) `to` Coloured vapours which turns starch iodide paper blue.Identify the acid radical and the coloured vapours giving the relevant chemical equations.

Text Solution

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The correct Answer is:
`2NO_(2)^(-) + H_(2)SO_(4) to SO_(4)^(2-) + 2HNO^(2)`
`3HNO_(2) to HNO_(3)+2NO+O_(2)`
`2NO+O to 2NO_(2) uarr` (Reddish brown)
`2KI+2NO_(2) to 2KNO_(2) +I_(2)`
Starch `+I_(2) to` blue
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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.

NO_(2) turns acidic KI -starch paper blue, why?

Knowledge Check

  • Bromine vapours will turn moist starch iodide paper

    A
    Brown
    B
    Red
    C
    Blue
    D
    Colourless

  • Which of the following gas turn starch iodide paper blue ?

    A
    `CO_(2)`
    B
    `SO_(2)`
    C
    `NO_(2)`
    D
    `H_(2)S`

  • Solution of a salt in dil H_(2)SO_(4) produces deep blue colour with starch iodide solution .The salt contains

    A
    `Br^(Theta)`
    B
    `I^(Theta)`
    C
    `NO_(2)^(Theta)`
    D
    `NO_(3)^(Theta)`

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