Give reasons for the following:
(i) Binary compounds of oxygen and fluorine are called fluorides.
(ii) Fluorine forms only one oxoacid HOF.
(iii) Noble gases have very low melting and boiling points.

Noble gases have very low melting and boiling points because.

Explain why fluorine forms only one oxoacid, HOF.

Give reasons for each of the following: Noble gases do not form compounds readily.

Give a reason for each of the following: Ionic compounds have a high melting point.

(a) Account for the following : (i) Ozone is thermodynamically unstable. (ii) Solid PCl_(5) is ionic in nature. (iii) Fluorine forms only one oxoacid HOF.

Account for the following: (a) Sulphurous acid is a reducing agent (b)Fluorine forms only one oxoacid (c) Boiling point of noble gases increases from He to Rn.

Account for the follwing : (i) Bi(v) is a stronger oxidizing agent then Sb(v). (ii) N-N single bond is weaker then P - P Single bond. (iii) Noble gases have very low boiling points.

Explain the following: Covalent compounds usually have low melting and boiling points.

Explain the following: lonic compounds have high melting point and boiling point while covalent compounds have low melting and boiling points.

Ionic bond is defined as the electrostatic force of attraction holding the oppositely charged ions. Ionic compounds are mostly crystalline solid having high melting and boiling points, electrical conductivity in moleten state, solubility in water etc. Covalent bond is defined as the force which binds atoms of same or different elements by mutual sharing of electrons in a covalent bond. Covalent compounds are solids, liquids or gases. They have low melting and boiling points compounds. They are more soluble in non-polar solvents. The amount of energy released when one mole of ionic solid is formed by packing of gaseous ion is called :