Explanation
All the mentioned acids are strongly oxidising in character.Hence these will form a thin protective film of oxide at the surface of Al and render it passive.
K2SO4.Al2(SO4)3 .24H2O is potash alum.
AlCl3 is a Lewis acid because it is electron deficient
Due to non toxicity of Al, it is used for food pack aging.
AlCl3 + 3H2O → Al(OH)3 + 3HCl
Al(OH)3 + NaOH → NaAlO2 + 2H2O
Al2O3 is Stable at high temperature, hardest alumina and is called corundum
Potash alum coagulates the blood.
Boron, the first member of group 13 elements is a non-metal.
2TlBr3 → Tl[TlBr4] + Br2
In aqueous solution the probable aluminate species is [Al(H2O)2(OH)4]- where the coordination number of Al is 6 .
In Hoope’s process for electrolytic refining of Al, the middle layer consists of cryolite and BaF2.
Colourless salt (i.e., Al2 (SO4)3) will not give borax bead test.
BN does not show magnetic properities since it does not posses unpaired electrons.
ln BF3, B undergoes sp2- hybridization forming σ-bond with each F atom. Then there is a pπ -pπ back bonding in B-F bond.
Carbon, the first member of group 14 elements does not have d-and f-orbitals and thus does not show inert pair effect.
In graphite, each carbon atom undergoes sp2- hybridization and is surrounded by three other carbon atoms through covalent bonding forming hexagonal rings.
Antidote for CO poisoning is carbogen which is a mixture of 95% O2 and 5% CO2
Graphite is thermodynamically more stable than diamond
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