Select correct answers from the choices A, B, C, D which are given. Write down only the letter corresponding to the correct answer.
Which of the following salts will give a dirty green precipitate with sodium hydroxide and a white precipitate with barium chloride?

Options

A. iron (III) sulphate
B. iron (iii) chloride
C. iron (II) sulphate
D. iron (II) chloride

Answer

To solve the question, we need to identify which salt produces a dirty green precipitate with sodium hydroxide (NaOH) and a white precipitate with barium chloride (BaCl2).

### Step-by-Step Solution:

1. **Identify the Reaction with Sodium Hydroxide**:
- We need to find a salt that reacts with NaOH to produce a dirty green precipitate.
- The salt that fits this description is **ferrous sulfate (FeSO4)**.
- When ferrous sulfate reacts with sodium hydroxide, it forms ferrous hydroxide (Fe(OH)2), which is a dirty green precipitate.
- The balanced reaction is:
\[ \text{FeSO}_4 + 2 \text{NaOH} \rightarrow \text{Fe(OH)}_2 \downarrow + \text{Na}_2\text{SO}_4 \]

2. **Identify the Reaction with Barium Chloride**:
- Next, we check the reaction of ferrous sulfate with barium chloride.
- When ferrous sulfate reacts with barium chloride, it produces barium sulfate (BaSO4), which is a white precipitate.
- The balanced reaction is:
\[ \text{FeSO}_4 + \text{BaCl}_2 \rightarrow \text{BaSO}_4 \downarrow + \text{FeCl}_2 \]

3. **Conclusion**:
- Since ferrous sulfate (FeSO4) produces a dirty green precipitate with NaOH and a white precipitate with BaCl2, the correct answer is **option C**.

### Final Answer:
C