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Zn^(2+) salts are colourless while Cu^(2...

`Zn^(2+)` salts are colourless while `Cu^(2+)` salts are coloured. Give reason.

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Knowledge Check

  • On addition of conc. H_2SO_4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

    A
    `H_2SO_4` reduces HI to `I_2`
    B
    HI is of violet colour
    C
    HI gets oxidised to `I_2`
    D
    HI changes to `HIO_3`

  • Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in the solid state ?

    A
    `Ag_(2)SO_(4)`
    B
    `CuF_(2)`
    C
    `ZnF_(2)`
    D
    `Cu_(2)Cl_(2)`

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    When Conc. H_2SO_4 is treated with chloride salt, a colourless pungent smelling HCl gas is produced, but when the same acid is treated with Bromide salt we get red vapour of bromine Explain.

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