(a) Sulphur melts form a clear mobile liquid at `119^@ C` but on further heating to `180^@ C`, it becomes viscous. Why ?
(b) `SOCl_2` can act as a weak Lewis acid as well as a weak Lewis base. Explain.

(a) Sulphur melts form a clear mobile liquid at 199^@ C but on further heating to 180^@ C , it becomes viscous. Why ? (b) SOCl_2 can act as a weak Lewis acid as well as a weak Lewis base. Explain.

Sulphur melts to a mobile liquid at 119^(@)C but becomes Viscous above 160^(@)C . It is due to

Do you expect the carbon hydrides fo the type (C_(n)H_(2n+2)) to act as 'Lewis' acid or base? Justify your answer.

Consider the following species: CF_(4),GeH_(4),BCl_(3),AlBr_(3),H_(2)O,PH_(3),PCl_(5),CO_(2),CH_(4) and calculate value of (x-y)^(2) : Where, x: Total number of species which can act as only lewis acid. y: total number of species which can act as lewis acid as well as lewis base.

Metal A burns in air, on heating, to form an oxide A_(2)O_(3) whereas another metal B burns in air only on strong beating to form an oxide BO. The two oxides A_(2)O_(3) and BO can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water. (a). What is the nature of oxide A_(2)O_(3) ? (b). What is the nature of oxide BO ? (c). Name one metal like A. (d). Name one metal like B.