Question

(a) Which property of colloids is responsible for the sun to look red at the time of setting ?
(b) C₂H₂ on addition with H₂ forms ethane inpresence of palladium catalyst but if reaction is carried in the presence of barium sulphate and quinoline, the product is ethane and not ethane. Why ?

Answer 1

(a) Sun is at horizon and blue part of the light is scattered away by the dust particles as light has to travel a long distance through the atmosphere.