Q22 of 70 Page 109

Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?

KMnO4 in +7 oxidation state has no d electrons but it is deep purple in colour. The colour arises due to ligand to metal charge transfer where the ligand O2- transfers charge to the metal centre.Ce (SO4)2 is also coloured due to charge transfer and is of intense yellow colour

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20

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because___________.

 21

Why is HCl not used to make the medium acidic in oxidation reactions of KMnO4 in acidic medium?

 23

Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?

 24

In the form of dichromate, Cr (VI) is a strong oxidising agent in acidic medium but Mo (VI) in MoO3 and W (VI) in WO3 are not because ___________.