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-Metal cations of s-block,p-block are colourless in gaseous or eg-phase while metal cations of d- block having d+o are coloured in aq.phase or in presence of other solvent like ammonia etc.
-Origination of colour in them due to d-electrical transition.
feso4.7H2o-Green ,Feso4-White,Cuso4.5H2o-Pale blue,Cuso4-White,ZnSo4.7h2o-white,ZnSo4- White
-Oxyacids,Oxyanions,monoatomic anions and hydides of non-metal are colourless while oxyanions of transition metal are coloured origination of colour in them is due to charge transfer spectrum.Their colour change by change in PH of medium.
-As polarisability of mono atomic anion is higher then polyatomic anion write given metal cation.Therefore,Probability of colour abservance in compounds of a metal cation will be higher when there is mono atomic anion.
-If iodide of a metal cation is coloured then to dide off mother metal action My+ which has higher all anions are colourless except oxyanion of traction metals.
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