`Cl_2` gas is obtained by various reactions select the reactions from the following (s):

Options

A. `KMnO_(4)(s)+Conc HCl
undersetto(Delta)`
B. `KCl(s)+K_(2)Cr_(2)O_(7)(s)+Conc H_(2)SO_(4)undersetto(Delta)`
C. `MnO_(2)(s)+Conc HClundersetto(Delta)`
D. `Kcl(s)+F_(2)(l) to`

Explanation

To determine which reactions produce chlorine gas (Cl₂), we will analyze each of the provided half-reactions step by step.

### Step 1: Analyze the first reaction
**Reaction:** KMnO₄ (s) + HCl (concentrated) → KCl + MnCl₂ + H₂O + Cl₂

1. **Identify Reactants and Products**:
- Reactants: KMnO₄ and concentrated HCl
- Products: KCl, MnCl₂, H₂O, and Cl₂

2. **Balancing the Reaction**:
- To balance this reaction, we need:
- 2 KMnO₄
- 16 HCl
- 2 KCl
- 2 MnCl₂
- 8 H₂O
- 5 Cl₂
- This reaction produces Cl₂.

**Conclusion**: This reaction produces chlorine gas.

### Step 2: Analyze the second reaction
**Reaction:** KCl (s) + K₂Cr₂O₇ (s) + H₂SO₄ (concentrated) → K₂SO₄ + CrO₂Cl₂ + H₂O

1. **Identify Reactants and Products**:
- Reactants: KCl, K₂Cr₂O₇, and concentrated H₂SO₄
- Products: K₂SO₄, CrO₂Cl₂, and H₂O

2. **Balancing the Reaction**:
- To balance this reaction, we need:
- 4 KCl
- 3 H₂SO₄
- 3 K₂SO₄
- 2 CrO₂Cl₂
- 3 H₂O
- This reaction does not produce Cl₂.

**Conclusion**: This reaction does not produce chlorine gas.

### Step 3: Analyze the third reaction
**Reaction:** MnO₂ (s) + HCl (concentrated) → MnCl₂ + H₂O + Cl₂

1. **Identify Reactants and Products**:
- Reactants: MnO₂ and concentrated HCl
- Products: MnCl₂, H₂O, and Cl₂

2. **Balancing the Reaction**:
- To balance this reaction, we need:
- 4 HCl
- 2 H₂O
- 1 Cl₂
- This reaction produces Cl₂.

**Conclusion**: This reaction produces chlorine gas.

### Step 4: Analyze the fourth reaction
**Reaction:** KCl (s) + F₂ (g) → KF + Cl₂

1. **Identify Reactants and Products**:
- Reactants: KCl and F₂
- Products: KF and Cl₂

2. **Balancing the Reaction**:
- To balance this reaction, we need:
- 2 KCl
- 2 KF
- This reaction produces Cl₂.

**Conclusion**: This reaction produces chlorine gas.

### Final Summary
The reactions that produce chlorine gas (Cl₂) are:
1. KMnO₄ + HCl → KCl + MnCl₂ + H₂O + Cl₂
2. MnO₂ + HCl → MnCl₂ + H₂O + Cl₂
3. KCl + F₂ → KF + Cl₂

The only reaction that does not produce Cl₂ is:
- KCl + K₂Cr₂O₇ + H₂SO₄ → K₂SO₄ + CrO₂Cl₂ + H₂O