A positively charged ion is known as  .

Consider the metals and solutions given in the box.

(a) Which of the above metals have to be selected to construct a Galvanic Cell? 
(b)Identify the anode and cathode of the cell. 

[Reactivity order $\mathrm{Mg} > \mathrm{Zn} > \mathrm{Cu} > \mathrm{Ag}$]

(c) Write the redox reaction taking place in the cell. 

The following is the correct decreasing order of the ionic radii- 

Give one phrase for the following statement:

Process of formation of ions from molecules which are not in the ionic state.

The charged species are known as ________.

A Positively charged ion is also called?