Question

a) Important allotropic forms of phosphorus are white phosphorus, red phosphorus and black phosphorus. Among these which allotropic form is more reactive? Why? 

b) In the manufacture of sulphuric acid (H₂SO₄) the final product obtained is oleum.

i) What is Oleum?

ii) Write chemical equation for the conversion of oleum to sulphuric acid.

c) Name the halogen which forms only one oxoacid and also write the formula of the oxo acid of that halogen.

d) Which element among inert gases form a maximum number of compounds? Write the formula of one of the compounds formed by the element.

Answer 1

a) White Qhosfhorus It consists of discrete tetrahedral P4 molecules.

b) i) Pyrosuiphuncacid

ii) H₂S₂O₇ + H₂O → 2H₂SO₄

c) Flounne or HOF or hypoflourous acid

d) Compounds – Xe F₂, XeF₄ Xe O₃, Xe OF₂ etc.,