| List - I (Salts | List - II (Van't Hoff factor |
|---|---|
| (A) Mohr's Salt | (I) 3 |
| (B) Blue Vitriol | (II) 8 |
| (C) Lime slake | (III) 2 |
| (D) Alum | (IV) 5 |
Consider the following reaction:
\[ A + NaCl + H_2SO_4 \xrightarrow[\text{Little amount}]{} CrO_2Cl_2 + \text{Side products} \] \[ CrO_2Cl_2(\text{Vapour}) + NaOH \rightarrow B + NaCl + H_2O \] \[ B + H^+ \rightarrow C + H_2O \]
The number of terminal 'O' present in the compound 'C' is ________.