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(a) Out of Ag(2)SO(4),CuF(2),MgF(2) and ...

(a) Out of `Ag_(2)SO_(4),CuF_(2),MgF_(2)` and CuCl, which compound will be coloured and why ?
(b) Explain :
(i) `CrO_(4)^(2-)` is a strong oxidising agent while `MnO_(4)^(2-)` is not
(ii) Zr and Hr have identical sizes.
(iii) The lowest oxidation state of manganese is basic while the highest is acidic.
(iv) Mn (II) shows maximum paramagnetic character amongst the divalent ions of the first transition series.

Text Solution

Verified by Experts

(a) `CuF_(2)` is coloured due to vacant d-orbital and presence of unpaired electron.
(b) (i) Cr in `CrO_(4)^(2-)` has oxidation state +6. It can reduce its oxidation state to +3 (in `Cr^(3+)`). Thus, it can act as oxidising agent. Mn in `MnO_(4)^(2-)` has oxidation state +6. But its most stable oxidation state is +7. Therefore, it does not act as oxidising agent.
(ii) Zr and Hf have identical sizes due to lanthanoid contraction.
(iii) Oxides of Mn in lowest oxidation state are ionic and form basic solution, whereas oxides in highest oxidation state are covalent and form acidic solution with water.

`Mn^(2+)` has the maximum number of unpaired electrons and, therefore, has the maximum paramagnetic character.
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(a) Out of Ag_(2)SO_(4), CuF_(2), MgF_(2) and CuCl, which compound will be coloured and why ? (b) Explain : (i) CrO_(4)^(2-) is a strong oxidizing agent while MnO_(4)^(2-) is not (ii) Zr and Hf have identical sizes. (iii) The lowest oxidation state of manganese is basic while the highest is acidic. (iv) Mn (II) shows maximum paramagnetic character amongst the divalent ions of the first transition series.

(a) Give reasons for the following : (i) Compounds of transition elements are generally coloured. (ii) MnO is basic while Mn_(2)O_(7) acidic. (b) Calculate the magnetic moment of a divalent ion squeous medium of its atomic number is 26.

Knowledge Check

  • Arrange the following in the increasing order of oxidation state of Mn: (i) Mn^(2+) (ii) MnO_(2) (iii) KMnO_(4) (iv) K_(2)MnO_(4)

    A
    `i gt ii gt iii gt iv`
    B
    `i lt ii lt iv lt iii`
    C
    `ii lt iii lt i lt iv `
    D
    `iii lt i lt iv lt ii`

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