D and F block

Question 1

why ‘d’-block elements are called transition elements

Answer 1

because of unpaired electron d-block elements can show transition from one energy level to another energy level

Question 2

why zn/cd/hg are not considered as transition element

Answer 2

because of lack of unpaired electron

Question 3

what is oxoanion

Answer 3

a molecule containing metal/non metal with oxygen and -ve charge on oxygen

Question 4

electronic config.

Answer 4

d block —Ns2(n-1)d 1 to 10

-n=min is 4

Question 5

physical properties of d-block

Answer 5

as d-block element are metallic in nature ,they show malleability, ductility, sonorus lusture
and all transition elements has strong metallic bonding due to unpaired electron

Question 6

why transition element has high enthalpy of atomization

Answer 6

because of strong metallic bonding due to unpaired electron

Question 7

why cr is the hardest metal in 3d series

Answer 7

due to the strongest metallic as max no. of unpaired electron

Question 8

catalytic property

Answer 8

D-BLOCK elements acts as a good catalyst because of variable oxidiazation STATE that they can reduse as well as oxidise in the same process

Question 9

complex formation

Answer 9

d-block element can form complexes because

-they have vacant outermost orbitals where ligands can donate their lone pair ND Form dative bond

Question 10

reducing property

Answer 10

which reduces other and oxidizes itself in the same process
increase in oxidation no.
decrease in oxidation

Question 11

size

Answer 11

across the period ,size decrease due to increase in effective nuclear charge

Question 12

ionization POTENTIAL

Answer 12

across the period in 3d series I.P increses upto mn and almost remain same upto cu and slight decrease in I.P
observed due to same size

Question 13

alloy formation

Answer 13

it is homogeneous mix of two or more than 2 metals and non metals