Question

The charges x and y on the following ions are

(i) $\lbrack Co(NH_{3})_{2}Cl_{4}\rbrack^{x}$

(ii) $\lbrack Fe(CN)_{6}\rbrack^{y}$

(Oxidations state of Co is +3 and Fe is +2 in their respective complexes )

• A. x = +1, y = -1
• B. x = -1, y = +3
• C. x = -1, y = -4
• D. x = -2, y = -3

Answer 1

Answer: (C)

x = -1, y = -4

Answer 2

In $\lbrack Co(NH_{3})_{2}Cl_{4}\rbrack^{x}$, oxidations state of Co = + 3

Hence, x = +3 + 2 × 0 + 4 × (-1)=-1

In $\lbrack Fe(CN)_{6}\rbrack^{y}$, Oxidations state of Fe = +2

Hence, y = +2 + 6 × (-1) = -4