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  • (a)    Give reasons for the following :             (i)    Compounds of transition elements are generally coloured.    &nbs

(a)    Give reasons for the following :
            (i)    Compounds of transition elements are generally coloured.
           (ii)    MnO is basic while Mn2O7 is acidic.

(b)    Calculate the magnetic moment of a divalent ion in aqueous medium if its atomic number is 26.

 

 

 

 
 
 
 
 

Answers (1)

(a)    (i)    Compounds of transition metals are generally coloured due to the presence of unpaired d electrons and d-d- transition, electrons get excited to higher energy d-orbitals which gives colour to compounds.

       (ii)    MnO is basic but Mn2O7 is acidic because MnO, oxidation state of Mn is +2 whereas, in Mn2O7, Mn is in +7 oxidation state. Lower oxidation state oxides being ionic produce oxide ions which in turn gives OH- ions, but higher oxides are covalent and it can accept electrons.

(b)    Mn^{2+} \text{ ion} = [Ar]^{18}3d^6 \qquad \text{At. no} = 26

Magnetic moment = \sqrt{4(4+2)} = \sqrt{24} = 4.89 \text{ BM}

Posted by

Sumit Saini

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