hydride Flashcards
ionic hydride also known as
saline hydride
stoichometric hydride
covalent hydride also known as
molecular hydride
stoichometric hydride
metallic hydride also known as
non-stoichometric hydride
interstitial hydride
ionic hydride is formed when
H combines with elements of s block except Be
NaH, CaH2
NaH(s) + H2O –>
NaOH + H2
reacts violently
CaH2 –>
burn spontaneously in air
Ca + H2
8LiH + Al2Cl –>
2LiAlH4 + 6LiCl
2LiH + B2H6 –>
2LiBH4
ionic hydride
physical properties
white crystalline solids
have ionic lattice
high mpt
high bpt
ionic hydride
volatile / non-volatile
non-volatile and non conducting in solid state
conduct electricity in fused state
covalent hydride is formed when
H combines with elements of p block
CH4, H2O, NH3
covalent hydride
volatile / non-volatile
volatile
classification of covalent hydride according to their relative no. of electrons and bonds in their lewis structure
- electron deficient
- electron precise
- electron rich
electron deficient covalent hydrides are formed by
group 13 elements
BH3 polymerise to B2H6
electron deficient covalent hydrides act as
lewis acid
as they are e- deficient so have tendency to accept e-
electron precise covalent hydrides are formed by
group 14 elements
tetrahedral geometry
CH4
electron rich covalent hydrides are formed by
group 15-17
electron rich hydride forms
H bonding
as presence of lone pair on electronegative element, results in association of molecules due h bonding
metallic hydride is formed by
group 3,4,5 (d block)
f block
in group 6, only Cr (CrH)
metallic hydride are non-stoichometric as
have variable composition, being deficient in H2
conducts electricity
metals used to ADSORB large volume of H?
used in?
Pd / Pt
used as its storage media, especially in cars working on fuel cells
