Consider the following statements.
(i) The outer sphere in coordination compound is called ionisation sphere.
(ii) The primary valences are non directional while secondary valences are directional.
(iii) The primary valances of a metal ion is negative and it is satisfied by positive ions.
Which of the above statements is/are not correct? .
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) only
(d) (ii) only
