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Why hydrated copper sulphate is blue whi...

Why hydrated copper sulphate is blue while anhydrous copper sulphate is white?

Text Solution

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In `CuSO_4`. `5H_2O` four water, molecules are present as ligands, in the rpesence iof thse lagands d-orbitals are no longer degenerate in energy. Hence d-d transition takes place absorbing red wavelength. The complementary place absorbing colour, viz, blue is reflected. In anhydrous `CuSO_4`, d-orbitals remain degenerate. Hence no d-d transition can occur. The white light is completely reflected back. Hence it looks white
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What is the colour of anhydrous copper sulphate ?

Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate . Giving an activity illustrate how these two are interconvertible .

Knowledge Check

  • The enthalpy change during the formation of 24.95 grams of hydrated copper sulphate from anhydrous copper sulphate (mol. Wt =159.5 ) is CuSO_(4)+5H_(2)O rarr CuSO_(4).5H_(2)O, DeltaH=-78.2 kJ

    A
    `-78.21 kJ`
    B
    `78.21 kJ`
    C
    `7.82 kJ`
    D
    `-7.82 kJ`

  • What happens when hydrate copper sulphate is heated ?

    A
    it becomes colourless
    B
    it turns into anhydrous salt
    C
    it loses water of crystallization
    D
    all of the above

  • The enthalpies of solution for copper sulphate pentahydrate and anhydrous copper sulphate are respectively + 11.7 and -65.5kJ mol^(-1) .The hydration enthalpy of anhydrous copper suphate is

    A
    `53.8 kJ mol^(-1)`
    B
    ` - 9.8 kJ mol^(-1)`
    C
    ` - 77.2kJ mol^(-1)`
    D
    ` -53.8 kJ mol^(-1)`

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    Calcium sulphate is found in nature in two forms, anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium suphate is heated to 200^(@) C, it forms anhydrous salt. Q. The anhydrous calcium sulphate is called :

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    The aqueous solution of copper(II) sulphate is slowly hydrolysis forming basic copper sulphate whose chemical composition is:

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