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Choose the correct option for the following sets: Set-I: All compounds give a metal (or stable element) on heating. Set-II: All compounds give a colorless gas on heating.

1. (A) Set-I: NaN3, HgO, Ag2O; Set-II: Pb3O4, NH4NO2, Ba(N3)2
2. (B) Set-I: PbO, HgO, KClO3; Set-II: NaN3, BaO2, PbO
3. (C) Set-I: Ba(N3)2, HgO, Ag2O; Set-II: PbO2, AgNO3, KClO3
4. (D) Set-I: Ba(N3)2, HgO, KClO3; Set-II: H2O2, CaO, NH4NO2

Correct answer: (A) Set-I: NaN3, HgO, Ag2O; Set-II: Pb3O4, NH4NO2, Ba(N3)2

Solution

NaN3 -> Na + N2, HgO -> Hg + O2, Ag2O -> Ag + O2 (all give metals/N2, satisfying Set-I). Pb3O4 -> PbO + O2, NH4NO2 -> N2 + H2O, Ba(N3)2 -> Ba + N2 — all gaseous products are colorless, satisfying Set-II.

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