physical properties

Question 1

d block elements have one or more typical metallic structure except for 4 metals. name them

Answer 1

zn, cd , hg, mn

Question 2

why do d block elements have high mp and bp?

Answer 2

incolvement of greater no of e from (n-1)d in addition to the ns electrons in the interatomic metallic bonding.

Question 3

metals of 2nd and third series have ___ enthalpies of atomisation than 1st series thus we see more _ bonding in heavier elements

Answer 3

greater
metal-metal

Question 4

what is the consequence of lanthnoid contraction?

Answer 4

similar radii of 2nd and 3rd radii

Question 5

what is the cause of lanthanoid contraction

Answer 5

imperfect shielding of an electron by another present in the same orbital

Question 6

the shielding of 4f orbital is____ than that of one d orbital

Answer 6

less

Question 7

enthalpy of atomisation is highest and least for ?

Answer 7

vanadium - highest
zinc- least

Question 8

why is there an irregular trend in first ionisation enthalpy in the metals of 3d series

Answer 8

removal of one electron alters the relative energies of 4s and 3d orbitals

Question 9

why is there an increase in second ionisation enthalpy?

Answer 9

one d e- does not shield another e- as both differ in direction

Question 10

when does the trend of inc in second ionisation and third enthalpy decrease ?

Answer 10

second- by the formation of Mn2+
third- Fe2+

Question 11

which energy is responsible for the stabilisation of energy state

Answer 11

exchange energy

Question 12

exchange energy is proportional to ?

Answer 12

total number of possible pairs of parallel spin in the degenerate orbitals

Question 13

there is no loss of exchange energy at __ configuration

Answer 13

d6

Question 14

which one has more ionisation enthalpy?
Mn+ & Cr+
Mn2+ & Fe2+

Answer 14

cr
mn

Question 15

what is the lowest common ox st of d block elements

Answer 15

+2

Question 16

which d block element shows only +2 ox st

Answer 16

sc

Question 17

which d block element shows only +3 ox st

Answer 17

sc

Question 18

in d block the highest oxidation states are acquired by what molecules

Answer 18

Tix4, CrF6, VF5

Question 19

beyond mn no halide has trihalides except?

Answer 19

fex3, CoF3

Question 20

fluorine stabalises ox st of compounds like CoF3 bcs of __ and VF5 CrF6 bcs of __

Answer 20

cof3- higher lattice energy
vf5 and crf6- higher covalent compounds

Question 21

why is cu2+ more stable than cu+

Answer 21

bcs higher hydration enthalpy of cu2+ which compensates for second ionisation enthalpy of cu

Question 22

what is highest mn fluoride and mn oxide

Answer 22

mnf4 and mn2 o7

Question 23

in mn2o7 how are mn surrounded by o molecules

Answer 23

tetrahedrally

Question 24

which d block element has positive M2+/M value?

Answer 24

cu

Question 25

the E- value of what metals are more negative than expected

Answer 25

Mn ni zn

Question 26

mn3+ n co3+ are strongest ____ agent

Answer 26

oxidising

Question 27

which ions are strongest reducing agent

Answer 27

ti2+ v2+ cr2+

Question 28

ferromagnetism is extreme form of _

Answer 28

paramagnetism

Question 29

substances that are attracted by applied field are ?

Answer 29

diamagnetic