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An iorganic white crystalline compound (A) has a rock salt structure. (A) on reaction with conc. `H_(2)SO_(4)` and `MnO_(2)`, evolves a pungent smelling, greenish-yellow gas (B). Compound (A) gives white ppt. of ( C) with `AgNO_(3)` solution. Compounds (A), (B) and (C) will be respectively:
A. `NaCl,Cl_(2)AgCl`
B. `NaBr,Br_(2),NaBr`
C. `NaCl,Cl_(2),Ag_(2)SO_(4)`
D. `Na_(2)CO_(3),CO_(2),Ag_(2)CO_(3)`

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