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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 lists : List-I List-II P. PbO 2 + H 2 SO 4 ⎯→ ⎯ ? PbSO 4 + O 2 + other product 1. NO Q. Na 2 S 2 O 3 + H 2 O ⎯→ ⎯ ? NaHSO 4 + other product 2. I 2 R. N 2 H 4 ⎯→ ⎯ ? N 2 + other product 3. Warm S. XeF 2 ⎯→ ⎯ ? Xe + other product 4. Cl 2 Codes : P Q R S

1. 4 2 3 1
2. 3 2 1 4
3. 1 4 2 3
4. 3 4 2 1

Correct answer: 3 4 2 1

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