Which of the following oxide is amphoteric in nature? (1) CO2 (2) SnO2 (3) SiO2 (4) GeO2
It is because of inability of ns2 electrons of the valence shell to participate in bonding that (a) Sn2+ is oxidising while Pb4+ is reducing (b) Sn2+ and Pb2+ are both oxidising and reducing (c) Sn4+ is reducing while Pb4+ is oxidising (d) Sn2+ is reducing ...
The one that is extensively used as a piezoelectric material is : (1) Quartz (2) Amorphous silica (3) Mica (4) Tridymite
Aluminium is usually found in +3 oxidation stagte. In contarast, thallium exists in +1 and +3 oxidation states. This is due to : (1) lanthanoid contraction (2) lattice effect (3) diagonal relationship (4) inert pair effect