The unbalanced chemical reactions given in List-$I$ show missing reagent or condition $(?)$ which are provided in List-$II$. Match List-$I$ with List-$II$ and select the correct answer using the code given below the lists:
List-$I$ List-$II$ $P. \ PbO_2 + H_2SO_4 \xrightarrow{?} PbSO_4 + O_2 + \text{other product}$ $1. \ NO$ $Q. \ Na_2S_2O_3 + H_2O \xrightarrow{?} NaHSO_4 + \text{other product}$ $2. \ I_2$ $R. \ N_2H_4 \xrightarrow{?} N_2 + \text{other product}$ $3. \ \text{Warm}$ $S. \ XeF_2 \xrightarrow{?} Xe + \text{other product}$ $4. \ Cl_2$
Codes: $P \quad Q \quad R \quad S$
| List-$I$ | List-$II$ |
| $P. \ PbO_2 + H_2SO_4 \xrightarrow{?} PbSO_4 + O_2 + \text{other product}$ | $1. \ NO$ |
| $Q. \ Na_2S_2O_3 + H_2O \xrightarrow{?} NaHSO_4 + \text{other product}$ | $2. \ I_2$ |
| $R. \ N_2H_4 \xrightarrow{?} N_2 + \text{other product}$ | $3. \ \text{Warm}$ |
| $S. \ XeF_2 \xrightarrow{?} Xe + \text{other product}$ | $4. \ Cl_2$ |
Codes: $P \quad Q \quad R \quad S$
- A$4 \quad 2 \quad 3 \quad 1$
- B$3 \quad 2 \quad 1 \quad 4$
- C$1 \quad 4 \quad 2 \quad 3$
- D$3 \quad 4 \quad 2 \quad 1$
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