Rubles and sapphire are chemically
AI2O3
AI2O3 + Ag2O3
Ag2O + Au2O3
AI2O3 + C
“Ammonal” used in bombs is a mixture of
AI + NH4NO3
AI + AI2O2 + B2O3
Ag2O3
Borazole is known as
Organic benzene
Organic compound
Inorganic compound
Inorganic benzene
Which of the flowing is most abundant among group 13 elements in the earth’s crust?
B
AI
Ga
In
Anodized aluminium is aluminium
Obtained on anode
Electrolytically coated with aluminium oxide
Alloy of aluminium containing 95% of AI
All of the above
The type of hybridization of boron in diborane is
sp
sp2
sp3
sp3d2
B(OH)3 is
Monobasic acid
Dibasic acid
Tribasic acid
Tetra basic
Corundum is
AI2(SO4)3
AI2O3.H2O
AI2O3.2H2O
Alumina may be converted into anhydrous ALCL3 by
Heating it with conc.HCI
Heating it in a current of dry chlorine
Heating it with rock salt
Mixing it with carbon and heating the mixture in a current of dry chlorine.
Which of the following is not correct in case of boron nitride, BN?
It is a good insulator
It is hard because in one of the modifications it has diamond (zinc blende) like structure
It shows magnetc properties
It is chemically unreactive
