MCQ
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 $II$ |
| $P.$ $PbO _2+ H _2 SO _4 \xrightarrow{?} PbSO _4+ O _2+$ other product | $1.$ NO |
| $Q.$ $Na _2 S _2 O _3+ H _2 O \xrightarrow{?} NaHSO _4+$ other product | $2.$ $I_2$ |
| $R.$ $N _2 H _4 \xrightarrow{\text { ? }} N _2+$ other product | $3.$ Warm |
| $S.$ $XeF _2 \xrightarrow{?} Xe +$ other product | $4.$ $Cl _2$ |
Codes: $ \quad P \quad Q \quad R \quad S $
- A$\quad 4 \quad 2 \quad 3 \quad 1 $
- B$\quad 3 \quad 2 \quad 1 \quad 4 $
- C$\quad 1 \quad 4 \quad 2 \quad 3 $
- ✓$\quad 3 \quad 4 \quad 2 \quad 1 $