Which of the flowing is most abundant among group 13 elements in the earth’s crust?
B
AI
Ga
In
The blue colored mineral ‘Lapis Lazuli’ which is used as a semiprecious stone is a mineral of the following class
Sodium aluminosilicate
Zinc cobaltate
Basic copper carbonate
All the above
Which of the following statements is correct?
BCI3 and AICI3 are both Lewis acids and BCI3 is stronger than AICI3
BCI3 and AICI3 are both Lewis acids and AICI3 is stronger than AICI3
BCI3 and AICI3 are both equally strong Lewis acids
Both BCI3 and AICI3 are not Lewis acids
Borax is not used
As a styptic to stop bleeding
In making enamel and pottery glazes
As a flux in soldering
In making optical glass
B(OH)3 is
Monobasic acid
Dibasic acid
Tribasic acid
Tetra basic
Alumnium becomes passive in
Conc: HNO3
H2CrO4
HCIO4
All
Group 13 elements exhibit
Only + 3 oxidation state
Only + 1 oxidation state
Both + 1 and + 3 oxidation states
+1, +3 and -3 oxidation states
Inorganic graphite is
B2O3
BN
B4C
B3N3H6
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.
Borazole is known as
Organic benzene
Organic compound
Inorganic compound
Inorganic benzene
