Search
.Management Sciences
Category: Group III A and IVA Elements
The metal which is used in thermite process because of its activity is____________________?
0
A. iron
B. copper
C. aluminium
D. zinc
Boron in soil has been considered micronutrient for_________________?
A. Soil porocity
B. Proper growth of plants
C. Alkalinity of soil
D. All
Borax is a white crystalline solid and it is_________________?
A. More soluble in cold water
B. More soluble in hot water
C. Insoluble in water
D. Soluble only in organic solvents
One of the outstanding features of boron is its ability to form__________________?
A. Molecular addition compounds
B. Molecular crystals
C. Semiconductors
D. Ionic compounds
The coloured glassy mass in borax bead test is due to the formation of___________________?
A. metal borate
B. metal meta borate
C. metal boride
D. metal silicate
Substance which is found in dried up lakes of Tibet and California is_______________?
A. Tincal
B. Boric acid
C. Calcium carbonate
D. Colemanite
If temperature of gallium arsenide is increased then its conductivity will___________________?
A. decrease
B. increase
C. remains constant
D. first decreases then increases
Which of the following will decompose to produce litharge_________________?
A. Pb2O
B. Pb3O4
C. PbO2
D. All of the above
Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.
A. 26%
B. 27%
C. 37%
D. <2.6%
Recent Comments