Question

i) d – Block elements belong to group 3 – 12 in the periodic table, in which the d orbitals are progressively filled. 

a) What is their common oxidation state?

b) Name two important compounds of transition elements.

c) Transition elements form a large number of complex compounds, why?

ii) What is mischmetal?

Answer 1

1. a) (n – 1)d^1-10 ns^1-2

b) Potassium dichromate, Potassium permanganate. KMnO₂

c) This is due to the following two factors: Cations of transition metals are very

• small in size
• high effective nuclear
• have vacant d – orbitals

2. ‘Misch metal’ is an alloy which consists of a lanthanoid metal (- 95%) and iron (- 5%) and traces of S, C, Ca and Al. It is used in Mg-based alloy to produce bullets, shell and lighter flint.