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Out of Cr^(2+) and Cr^(3+), which one is...

Out of `Cr^(2+)` and `Cr^(3+)`, which one is stable in aqueous solution?

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Calculate the number of unpaired electrons in the following gaseous ions: Mn^(3+) , Cr^(3+) , V^(2+) and Ti^(3+) , Which one of these as the most stable in aqueous solution?

Knowledge Check

  • When the ion Cr_2 O_(7)^(2-) acts as an oxidant in acidic aqueous solution the ion Cr^(3+) is formed. How many mole of Sn^(2+) would be oxidised to Sn^(4+) by one mole of Cr_(2)O_(7)^(2-) ions?

    A
    `2//3`
    B
    `3//2`
    C
    `2`
    D
    `3`

  • When the ion Cr_2O_7^(2-) acts as an oxidant in acidic aqueous solution the ion Cr^(3+) is formed. How many mole of Sn^(2+) would be oxidised to Sn^(4+) by one mole of Cr_2O_7^(2-) ions?

    A
    `2//3`
    B
    `3//2`
    C
    `2`
    D
    `3`

  • Assertion : The complex K_3 [Cr(C_2O_4)_3] when present in aqueous solution, will give test for K^(+), Cr^(3+) and oxalate ions. Reason : The complex K_3[Cr(C_2O_4)_3] will dissociate completely in solution.

    A
    If both (A) and (R) are correct and (R) is the correct explanation of (A).
    B
    If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
    C
    If (A) is correct, but(R) is incorrect.
    D
    If both (A) and (R) are incorrect.

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    How would you account for the following: i. Of the dot d^(4) species, Cr ^2+ is strongly reducing while manganese(III) is strongly oxidising. ii. Cobalt(II) is stable in aqueous solution but. in the presence of complexing reagents it is easily oxidised. ii. The d^1 configuration is very unstable in ions?

    If the formula mass of C r _(2) O _(7) ^( 2-) ion is M, then in the reaction Cr _(2) O _(7) ^( 2-) + 14 H ^(+) + 6 e ^(-) to 2 Cr ^(3+) + 7 H _(2) O, The equivalent mass of Cr _(2) O _(7) ^(2-) is

    The standard electrode potential corresponding to the reduction Cr^(3+)+ e to Cr^(2+) is E^@=-0.407 volt. IF excess Fe(s) is added to a solution in which [Cr^(3+)]=1M , what will be [Fe^(2+)] when equilibrium is established at 25^@C [Fe (s)+2Cr^(3+) leftrightarrow Fe^(2+)+ 2Cr^(2+)]

    Among the following which one of the aqueous solutions has highest boiling point?

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