N,P,As,Sb and Bi belong to the group? Which element does not show allotropy form? Covalency of 3 and 5 is shown by? Which is a reducing agent? Which substance acts as both oxidizing and reducing agent? Phosphorus can for phosphorus penta chlorine but nitrogen cant do this because? Which is the stable form of phosphorus? Which one is most reactive form of phosphorus? Which is incorrect about phosphorus? Which is not ore of sulphur? Among group VA of periodic table phosphorus, arsenic and _____________ have alltropes? Aqua vegia is prepared by mixing one volume of Conc? HNO3 with _____ volumes of Conc? HCl? Phosphorus acid decomposes into orthophosphoric acid and __________ gas?
All the elements of group VIA are non-metals except ________ which is a radioactive element? Cold dilute acids reacts with almost all metals to produce ___________ gas? Sulphuric acid as a dehydrating agent with elleyl alcohol forms water and _____________? Galena, Zinc blend and cinnabar are important metallic ones of ______________? Electro negativity of nitrogen is _____________?
Three and five are the common valencies of the group VA elements? Moderately dilute nitric acid gives NO2 while Conc? Nitric acid gives NO? (Nitrous acid)? Melting point of phosporus acid is 90Co? Except oxygen the other members of the group show a covalency of +2, +4 and +6? Freezing point of phosphorus trichloride is – 100Co? TNT and Picric acid are formed by nitric acid? Ring test is used for the confirmation of ? Sublimation of phosphorus pentoxide occurs at?