P Block 1 Flashcards
Grp 13 radii
Grp 13 IE
Grp 13 MP
Grp 13 density order
increases from B to Tl
Tendency to behave like an Lewis acid for halides decreases / increases down the grp?
decreases
Color of boron
hard black colored solid
Why is gallium useful for measuring high temperatures?
gallium has an unusually low melting point and hence exists in a liquid state during summer!
Trichlorides on hydrolysis in water form what?
tetra hedral [M (OH)4]-
Which type of boron reacts with stuff
amorphous boron reacts
TlI3 structure(thallium)
its made of Ti3+ and I-3
White fumes appear from the bottle of AlCl3, why!?
anhydrous aluminum chloride is partially hydrolyzed with the atmospheric moisture to liberate HCl gas, Moist HCl appears white in color
Boron structure draw B12(and how many corners and faces)
Extraction of boron(From colemanite)
Borax formula both type
Borax beads forming process
Borax bead color of different metals(Fe,Co,Cu,Ni,Cr)
Orthoboric acid formula and struture
H3BO3
Orthoboric acid in water forms
Orthoboric acid heated
What is added in titration reaction to get end point with H3Bo3 as acid
cis 1,2 diolnis is added
Diborane prep from LiAlH4 and__ and the whole reaction
Diborane color, toxicity
colorles and highly roxic
Diborane number of 3c 2e and 2c 2e bonds plus structure
2 3c 2e bonds4 2c 2e bonds
Diborane with exposure to air reaction
and is it spontaneous or not and what abt its explosivity
yes spontaneous and explosive
Diborane with ammonia forms and then when heated the product..!?
What is used in making bullet proof vests
boron fibres are used
Boron is used as what in the nuclear industry
control rods as it can absorb the neutrons
Which isotope of boron can absorb neutrons
Boron-10
Which isotope of carbon is radioactive
C-14
aluminum chloride in acidified aqueous solution forms ____
octahedral [Al(H2O)6]3+
Borax structure
what sthe angle between B-H-B bond in diborane
90 degree
which boron halide can behave as lewis acid when reacting with its ionic form
AlOH3 is white ppt and formed whaen NaOH is in limit
in excess it forms the below product
LiH with B2H6 forms?
all boron atoms are not in the same plane as 2 atoms are sp2 hybridised and 2 are sp3 hybridised
the B with 4 bonds is sp3
it behaves as a weak acid due to releasing H+ and and forming B(OH)4^1-
adding ethylene glycol results in the reaction between it and the B(OH)4^1- which hence leads to protection of the latter in getting into the reverse reactions and hence it will become more and more acidic due to the releasing of H+ ions
Al(CH3)3 has 2e electrons from the bond of Al-C and 3 centers (Al-C-Al) hence it’s a 2e 3c bond
AlCl3 dimer has 2 electrons from the Cl atom and 2 e from the Al-C electrons and 3 centers (Al-C-Al) and hence 4e 3c bond
BCl3 doesn’t form a dimer and hence has the deficiency which makes it a good lewis acid whereas AlCl3 forms a dimer and hence the deficiency isn’t there which makes it a bad lweis acid
the lone pair on N gets distributed to the vacant orbitals of Si and hence it’s not planar also the electrons are not much available for the donation which makes it less basic
why does B have the highest melting point?
because it has a 3D structure
back bonding strength order of boron halides
mohr’s salt and potash alum formulae
