d block Flashcards
exception in ec in the d block
Pd 4d10 5s0
all metals except Sc form MO which are
ionic
on increasing oxidation state ionic character
decreases
Mn2O7
covalent green oil
CrO3 and V2O5 have — mp
have low mp
V2O5
amphoteric oxide
Acidified vanadium oxide gives
VO4 3- VO2+
M2+/M of V and Mn are ——
less
Sublimation enthalpy for V and Mn are
less
Ti and V react w dilute non oxidizing acids at rt
false
catalyst in contact process
V2O5
are Zn Cd Hg Cn transition metals
no cuz they have filled orbitals in there grounded and in common os states
the d orbitals of transition metal protude the periphery more than s and p orbitals
The transition metals (with the exception
of ——–) are very hard and have low
volatility. Their melting and boiling points are
high.
Zn, Cd and Hg
exchange enrgy is responsible for
stabilization of the energy state
exchange energy is proportional to
total number of possible pairs of parrallel spins in degenerate orbitals
titanium (IV) is more stable
than Ti(III) or Ti(II).
os of scandium
3
os of mn
2 to 7
os of zn
2
cu had positive or negative E0
+ive
accounts for its inability to release h2 from acids
-E0 for ni is related to
high hydration enthalpy
hdration enthalpy of Cu +2 is more negative or less than
Cu +1
chromite ore
fecr2o4
sodium dichromate is more soluble than
potassium dichromate
sodium chromate color
yellow
sodium dichromate
orange
K2MnO4
dark green
KMno4 are isostructural w
KClO4
The more positive the standard electrode potential
the more stable the species is in its reduced form
the more negative the standard electrode potential
the more stable the species is in its oxidized form
the ability of F to stanlize the higher oxidation state is due to
high lattice energy (as in CoF3) or higher bond enthalpy (VF5,CrF6)
Mo(6) and W (6) are more stable than
Cr(6)
low os are found in an complex compund when
they are capable of pi acceptor charcted and sigma bonding
Cu + is unstable thus disproportionated into
cu +2 cu
K2MnO4 color
green
os of cr
2 to 6
M3+/M2+ value of Sc is less becuz
Sc+3 has noble gas configuration
M3+/M2+ value of V is less becuz
Half filled t2g
catalyst in haber process
catalyst in catalytic hydrogenation
fe
ni
Sc makes—–oxides
covalent
Brass
bronze
cu zn
cu pb
