Question

1.why transition metals and their compounds act as a catalyst? 2.The outer electronic configurations of two members of the lanthanide series as follows:4f15d16s2 and 4f75d06s2.what are their atomic numbers?predict the oxidation states exhibited by these elements in their compounds?

Answer 1

1Transition elements have variable oxidation states & valances that's why they acts catalyst.
2 take a periodic chart and find out!
3- +3

Answer 2

Answer: The transition element and thier compounds show good catalytic properties because

a) The have variable valency

b) Show multiple oxidation state

C) Form unstable intermediate compounds

d) Provide new path with lower activation energy for reaction.

e) In some cases transition elements also provide a path with lower activation energy for the reaction.