What type of colloid is formed when a solid is dispersed in a gas? Give an example.

Give reasons for the following:

(a) Transition metals show variable oxidation states.

(b) Evalue for (Zn²⁺/Zn) is negative while that of (Cu²⁺/Cu) is positive.

(c) Higher oxidation state of Mn with fluorine is +4 whereas with oxygen is +7.

Arrange the following in decreasing order of solubility in water:

(C₂H₅)₂NH, C₂H₅NH_2, C₆H₅NH₂

What is the difference between amylose and amylopectin.

OR

Write the products obtained after hydrolysis of lactose.

Give reasons:

(a) An increase in temperature is observed on mixing chloroform and acetone.

(b) Aquatic animals are more comfortable in cold water than in warm water.