MCQ
Find the odd one out :
- A$K _4\left[ Fe ( CN )_6\right]$
- B$Na \left[ Ag ( CN )_2\right]$
- C$K _2\left[ Zn ( CN )_4\right]$
- ✓$\left[ Cu \left( NH _3\right)_4\right] SO _4$
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