f block

Question 1

what is the common electronic configuration of lanthanoid series

Answer 1

6s2

Question 2

what is the most stable oxidation state of lanthanoid elements

Answer 2

+3

Question 3

what configuration do tripositive elements have

Answer 3

4fn

Question 4

Zr and Hf have same radii why?

Answer 4

lanthanoid contraction

Question 5

which metal in lanthanoid series is steel hard and has highest melting point

Answer 5

samarium

Question 6

density and other properties changes smoothly in lanthanoid series except for ?

Answer 6

Eu & Yb

Question 7

many trivalent lanthanoids are coloured in solid as well as aqueous state this is because

Answer 7

presence of f electrons

Question 8

which trivalent lanthanoids do not show colour

Answer 8

La3+ and Lu3+

Question 9

except for _ and _ type all lanthanoids are paramagnetic

Answer 9

f0 f14

Question 10

the first ionisation enthalpy of lanthanoids is similar to which s block element

Answer 10

calcium

Question 11

the increasing atomic number is more like which s block element

Answer 11

aluminium

Question 12

what is the composition of mischmetal

Answer 12

lanthanoid- 95%
iron - 5%
and traces of s, c , ca , al

Question 13

what is the best single use of lanthanoids

Answer 13

production of alloy steel for plates and pipes

Question 14

what is the common oxidation state of actinoids

Answer 14

7s2

Question 15

what is the use of TiO, MnO2

Answer 15

TiO- pigment industry
MnO2- dry battery

Question 16

what are group 11 worthy of being called

Answer 16

coinage metal