d block

Question 1

exception in ec in the d block

Answer 1

Pd 4d10 5s0

Question 2

all metals except Sc form MO which are

Answer 2

ionic

Question 3

on increasing oxidation state ionic character

Answer 3

decreases

Question 4

Mn2O7

Answer 4

covalent green oil

Question 5

CrO3 and V2O5 have — mp

Answer 5

have low mp

Question 6

V2O5

Answer 6

amphoteric oxide

Question 7

Acidified vanadium oxide gives

Answer 7

VO4 3- VO2+

Question 8

M2+/M of V and Mn are ——

Answer 8

less

Question 9

Sublimation enthalpy for V and Mn are

Answer 9

less

Question 10

Ti and V react w dilute non oxidizing acids at rt

Answer 10

false

Question 11

catalyst in contact process

Answer 11

V2O5

Question 12

are Zn Cd Hg Cn transition metals

Answer 12

no cuz they have filled orbitals in there grounded and in common os states

Question 13

the d orbitals of transition metal protude the periphery more than s and p orbitals

Question 14

The transition metals (with the exception
of ——–) are very hard and have low
volatility. Their melting and boiling points are
high.

Answer 14

Zn, Cd and Hg

Question 15

exchange enrgy is responsible for

Answer 15

stabilization of the energy state

Question 16

exchange energy is proportional to

Answer 16

total number of possible pairs of parrallel spins in degenerate orbitals

Question 17

titanium (IV) is more stable

Answer 17

than Ti(III) or Ti(II).

Question 18

os of scandium

Answer 18

3

Question 19

os of mn

Answer 19

2 to 7

Question 20

os of zn

Answer 20

2

Question 21

cu had positive or negative E0

Answer 21

+ive

accounts for its inability to release h2 from acids

Question 22

-E0 for ni is related to

Answer 22

high hydration enthalpy

Question 23

hdration enthalpy of Cu +2 is more negative or less than

Answer 23

Cu +1

Question 24

chromite ore

Answer 24

fecr2o4

Question 25

sodium dichromate is more soluble than

Answer 25

potassium dichromate

Question 26

sodium chromate color

Answer 26

yellow

Question 27

sodium dichromate

Answer 27

orange

Question 28

K2MnO4

Answer 28

dark green

Question 29

KMno4 are isostructural w

Answer 29

KClO4

Question 30

The more positive the standard electrode potential

Answer 30

the more stable the species is in its reduced form

Question 31

the more negative the standard electrode potential

Answer 31

the more stable the species is in its oxidized form

Question 32

the ability of F to stanlize the higher oxidation state is due to

Answer 32

high lattice energy (as in CoF3) or higher bond enthalpy (VF5,CrF6)

Question 33

Mo(6) and W (6) are more stable than

Answer 33

Cr(6)

Question 34

low os are found in an complex compund when

Answer 34

they are capable of pi acceptor charcted and sigma bonding

Question 35

Cu + is unstable thus disproportionated into

Answer 35

cu +2 cu

Question 36

K2MnO4 color

Answer 36

green

Question 37

os of cr

Answer 37

2 to 6

Question 38

M3+/M2+ value of Sc is less becuz

Answer 38

Sc+3 has noble gas configuration

Question 39

M3+/M2+ value of V is less becuz

Answer 39

Half filled t2g

Question 40

catalyst in haber process
catalyst in catalytic hydrogenation

Answer 40

fe
ni

Question 41

Sc makes—–oxides

Answer 41

covalent

Question 42

Brass
bronze

Answer 42

cu zn
cu pb