Question

When $AgNO _{3}$ solution is added in excess to $1\, M$ solution of $CoCl _{3} \cdot x NH _{3}$, one mole of $AgCl$ is formed. What is the value of $x$ ?

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (D)

When $AgNO _{3}$ is added to $CoCl _{3} \cdot x NH _{3}$ one mole of $AgCl$ is formed hence, the value of $x$ is 4
${\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right] Cl \rightleftharpoons\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right]^{+}}$
$+\underset{\text{can be precipitated}}{Cl ^{-}}$