The metal which is used in thermite process because of its activity is____________________?
A. iron
B. copper
C. aluminium
D. zinc
Group III A and IVA Elements
Which of the following does not give Borax bead test ?
Which of the following does not give Borax bead test ?
A. Cu
B. Cr
C. Ni
D. A1
Substance which is found in dried up lakes of Tibet and California is_______________?
Substance which is found in dried up lakes of Tibet and California is_______________?
A. Tincal
B. Boric acid
C. Calcium carbonate
D. Colemanite
Boron in soil has been considered micronutrient for_________________?
Boron in soil has been considered micronutrient for_________________?
A. Soil porocity
B. Proper growth of plants
C. Alkalinity of soil
D. All
Which of the following is metasilicic acid ?
Which of the following is metasilicic acid ?
A. H2SnO3
B. H2SiO3
C. H3AsO4
D. H3SbO4
Which of the following will decompose to produce litharge_________________?
Which of the following will decompose to produce litharge_________________?
A. Pb2O
B. Pb3O4
C. PbO2
D. All of the above
If temperature of gallium arsenide is increased then its conductivity will___________________?
If temperature of gallium arsenide is increased then its conductivity will___________________?
A. decrease
B. increase
C. remains constant
D. first decreases then increases
The coloured glassy mass in borax bead test is due to the formation of___________________?
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
Boron is non metal while other elements of IIIA group are metals. This is because______________?
Boron is non metal while other elements of IIIA group are metals. This is because______________?
A. it has small size
B. it has high nuclear charge
C. it forms molecular addition compounds
D. all of the above
Silicon differ from silica by a group of__________________?
Silicon differ from silica by a group of__________________?
A. Ch3
B. OH
C. OCH3
D. O2