D and F block

Question 1

what are transition metals

Answer 1

metals who have partially filled d orbital are transition metals

Question 2

what are D block elements

Answer 2

the elements whose ultimate electron enters d orbital

Question 3

which group elements are not transition metals

Answer 3

Group 12

Question 4

what is Group 12 in Mendeleevs table known as

Answer 4

II B

Question 5

name some properties of transition metals

Answer 5

1 Can act as catalyst
2 Paramagnetic (due to unpaired electrons)
3 very high MP and BP

Question 6

Name some transition metals which have very low MP and BP

Answer 6

Zinc
Cadmium
Mercury

Question 7

Why group 12 elements have very low MP and BP

Answer 7

Due to completly filled D orbital
Less electron involved in bonding

Question 8

When going from 4d to 5d atomic size almost remains same . Why?

Answer 8

due to poor shielding of 4f orbital

Question 9

What is Lanthanoid contraction

Answer 9

the filling of 4f before 5d orbital results in regular decrease in atomic radii called Lanthnaoid contraction

Question 10

why transition metals have high density

Answer 10

decrease in metallic radius with increase in atomic mass results in increase in density

Question 11

On what factors ionisation enthalpy depends on

Answer 11

attraction of electron by nucleus
repulsion between electron
Exchange energy (depends on no of parallel spin)

Question 12

why the ionisation enthalpy of Mn + smaller than Cr +

Answer 12

because electron removed in Mn is not taking part in exchange

Question 13

what is common oxidation state of transition metals

Answer 13

+2

Question 14

Why transition metals shows variable valency

Answer 14

due to incomplete filling of d orbital

Question 15

which metal has negative Eo vlaue

Answer 15

Copper (cannot liberate H+ from acids )

Question 16

which metal forms trihalide

Answer 16

Magnesium(ONLY)

Question 17

Why flourine is more stable with higher oxidation states

Answer 17

due to higher lattice energy

Question 18

why Cu+2 is more stable than Cu+

Answer 18

Cu +2 has more negative hydration enthalpy hence it compensates for ionisation enthalpy of Cu

Question 19

Define ferromagnets

Answer 19

substance which are attracted very strongly are said to be ferromagnets

Question 20

What is d-d transition

Answer 20

electron present in lower energy d orbital absorbs energy and goes higher energy d orbital it is called d-d transition

Question 21

what are interstitial compounds

Answer 21

interstitial compounds are those which are formed when small compounds like H C or N are trapped inside the crystal lattices of metals

Question 22

Name some properties of intertitial compounds

Answer 22

high MP
very hard
metallic conductivity
chemically inert

Question 23

What are alloys

Answer 23

Homogenous solid solution in which the atoms of one metal is distributed randomly among the atoms of the other
Example
brass = Copper + Zinc
bronze = copper + tin

Question 24

what is the color of K2MnO4

Answer 24

Green

Question 25

what is the color of MnO2

Answer 25

black

Question 26

What is common oxidation state of lanthanoids

Answer 26

+3

Question 27

What is CAN test

Answer 27

it stands for cerric ammonium nitrate test
Used to detect the presence of alcohol

Question 28

properties of lanthanoids

Answer 28

silvery white color
soft metals
tranish rapidly in air

Question 29

Which lanthanoid is the hardest

Answer 29

Samarium

Question 30

which metal has the lowest oxidation potential

Answer 30

Europium
due to 4f 7

Question 31

What is mischmetall

Answer 31

Iron + lanthanoid metal

Question 32

Actnoid contractions is greater than lanthanoid contraction WHY

Answer 32

5f orbitals have a poorer shielding effect than 4f

Question 33

What is Ziengler catalyst

Answer 33

TiCl4 + AL(CH3)3
used in production of polythenes

Question 34

What is Wacker process

Answer 34

oxidation of ethyne to ethanal in presence of PdCl2