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When conc. H(2)SO(4) is added into an ...

When conc. `H_(2)SO_(4)` is added into an unknown salt taken in a test- tube a, brown gas A is evolved . The colour of the gas in intensified when Cu - turning are added into the test-tube . When A is cooled , colourless gas A B is obtained . Identify A and B and write the reaction involved.

Text Solution

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A : `NO_(2)`, B : `N_(2)O_(4)`
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Knowledge Check

  • When conc. H_(2)SO_(4) is added to a chloride salt, white fumes are evolved but in the case of iodide salts brown fumes are evolved . This is because -

    A
    HI is reduced to yield `I_(2) ` by `H_(2)SO_(4)`
    B
    The colour of HI is brown
    C
    HI is oxidised to gives `I_(2)`
    D
    HI becomes converted to `HIO_(3)`.

  • The colour of the solution turns blue when a Cu - plate is dipped in a colourless solution of -

    A
    `KNO_(3)`
    B
    `AgNO_(3)`
    C
    `Zn(NO_(3))_(2)`
    D
    `ZnSO_(4)`