Which one of the following pairs of reactantas does not form oxygen when they react with each other ?

Options

A. `F_(2),NaOH` solution (hot, conc.)
B. `F_(2),H_(2)O`
C. `CI_(2),NaOH` solution (cold, dilute)
D. `CaOCI_(2),H_(2)SO_(4)` (dilute, small amount)

Explanation

To determine which pair of reactants does not form oxygen when they react with each other, we will analyze each given reaction step by step.

### Step-by-Step Solution:

1. **Identify the Reactions**: We have four pairs of reactants to analyze. Let's denote them as:
- A: F2 + NaOH
- B: F2 + H2O
- C: Cl2 + NaOH
- D: Ca(OCl)2 + H2SO4

2. **Analyze Reaction A (F2 + NaOH)**:
- The reaction produces sodium fluoride (NaF), water (H2O), and oxygen (O2).
- Balanced equation:
\[ 2F_2 + 4NaOH \rightarrow 4NaF + 2H_2O + O_2 \]
- **Conclusion**: Oxygen is formed.

3. **Analyze Reaction B (F2 + H2O)**:
- The reaction produces hydrofluoric acid (HF) and oxygen (O2).
- Balanced equation:
\[ 2F_2 + 2H_2O \rightarrow 4HF + O_2 \]
- **Conclusion**: Oxygen is formed.

4. **Analyze Reaction C (Cl2 + NaOH)**:
- The reaction produces sodium chloride (NaCl), sodium hypochlorite (NaClO), and water (H2O).
- Balanced equation:
\[ Cl_2 + 2NaOH \rightarrow NaCl + NaClO + H_2O \]
- **Conclusion**: No oxygen is formed.

5. **Analyze Reaction D (Ca(OCl)2 + H2SO4)**:
- The reaction produces calcium chloride (CaCl2), calcium sulfate (CaSO4), hydrochloric acid (HCl), and oxygen (O2).
- Balanced equation:
\[ Ca(OCl)_2 + H_2SO_4 \rightarrow CaCl_2 + CaSO_4 + 2HCl + O_2 \]
- **Conclusion**: Oxygen is formed.

6. **Final Conclusion**:
- From the analysis, we find that only Reaction C (Cl2 + NaOH) does not produce oxygen when the reactants react with each other. Therefore, the answer is **C**.