Q. One mode of a complex compound $Co\left( NH_{3} \right)_{5}Cl_{3}$ gives three moles of ions on dissolution in water. One of the same complex reacts with two moles of $AgNO_{3}\$solution to yield two moles of $AgCl(s)$. The structure of the complex is
A) $\left\lbrack Co\left( NH_{3} \right)_{3}Cl_{3} \right\rbrack \bullet 2NH_{3}$
B) $\left\lbrack Co\left( NH_{3} \right)_{4}Cl_{2} \right\rbrack \bullet Cl \bullet NH_{3}$
C) $\left\lbrack Co\left( NH_{3} \right)_{4}Cl \right\rbrack Cl_{2} \bullet NH_{3}$
D) $\left\lbrack Co\left( NH_{3} \right)_{5}Cl \right\rbrack Cl_{2}$
Explanation
(d)
$2Cl^{-}\$ions are inisable
$\therefore\left\lbrack Co\left( NH_{3} \right)_{5}Cl \right\rbrack Cl_{2} \rightleftharpoons \underset{3\ ions}{\overset{\left\lbrack Co\left( NH_{3} \right)_{5}Cl \right\rbrack^{2 +} + 2Cl^{-}}{︸}}$
$2Cl^{-}\ + 2AgNO_{3} \longrightarrow 2AgCl + 2NO_{3}^{-}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.