9:40
Elements of group 16 79,18 X explanation of electrodes of group 1617 and 18 and a structure of acids
Crown Academy Manish
29:47
Elements of group 1617 and 18 explanation of compounds of oxo acids and preparation of oxygen
52:40
Elements of group 16,17 & 18 anamolius behaviour of o2 F2 & reactivity of gp of it with O2 H2 &X2
