Aluminium oxide is_________________?
A. Acidic oxide B. Basic oxide C. Amphoteric oxide D. It does not exists
Chemistry MCQs
Which electronic configuration corresponds to an element of group IIIA ?
A. 1s2 2s2 2p3 B. 1s2 2s2 2p6 3s2 3p1 C. 1s2 2s2 2p4 D. 1s2 2s2 2p6 3s2 3p6 4s2 3d1
Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C.
A. 26% B. 27% C. 37% D. <2.6%
Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?
A. As nitrometer B. To remove air bubbles from molten metal C. To produce alloy D. As insulator
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
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
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
Which of the following is metasilicic acid ?
A. H2SnO3 B. H2SiO3 C. H3AsO4 D. H3SbO4