Question

The reversible reaction

$[Cu(NH_{3})_{4}]^{2 +}+S(O_{3})^{2 -}\rightleftharpoons [Cu(NH_{3})_{3}SO_{3}]+NH_{3}$

is at equilibrium. What would not happen if ammonia is added -

• A. $\left[S O_{3}^{2 -}\right]$ would increase
• B. $\left[C u \left(N H_{3}\right)_{3} S O_{3}\right]$ would increase
• C. The value of equilibrium constant would not change
• D. $[C u \left(N H_{3}\right)_{4}]^{2 +}$ would increase

Answer 1

Answer: (B)

$NH_{3}$ is presenting on product side. Hence on adding $NH_{3}$ , equilibrium shift to backward thus concentration of $\left[C u \left(N H_{3}\right)_{3} S O_{3}\right]$ would decrease.