Q20 of 70 Page 105

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

Due to lanthanide contraction, the f electrons shield very poorly which leads to an increase in effective nuclear charge and hence a contraction in size. So, the atomic radii of Zirconium and Hafnium are very similar and therefore they have similar physical and chemical properties.

More from this chapter

All 70 →
18

When acidified K2Cr2O7 solution is added to Sn2+ salts then Sn2+ changes to

 19

Highest oxidation state of manganese in fluoride is +4 (MnF4) but highest oxidation state in oxides is +7 (Mn2O7) because ____________.

 21

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

 22

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?