MCQ
In the reaction $A$ is


- ✓$H_3PO_2$ and $H_2O$
- B$H^+/H_2O$
- C$HgSO_4/H_2SO_4$
- D$Cu_2Cl_2$

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$(I)\, K_4 [Fe(CN)_6]$ $(II)\, K_3[Cr(CN)_6]$ $(III)\, K_3 [Co(CN)_6]$ $(IV)\, K_2[Ni(CN)_4]$
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