Question

The reversible reaction
$\left[\right.Cu\left(\right.NH_{3}\left(\left.\right)_{4}\left(\left]\right.\right)^{2 +}+S\left(O_{3}\right)^{2 -}\rightleftharpoons\left[\right.Cu\left(\right.NH_{3}\left(\left.\right)_{3}SO_{3}\left]\right.+NH_{3}$
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. $\left(\left[C u \left(N H_{3}\right)_{4}\right]\right)^{2 +}$ 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.