$A$ greenish-yellow gas reacts with an alkali metal hydroxide to form a halide that is used in the manufacture of safety matches and fireworks. Identify the gas and the halide,respectively.
- A$Br_2, KBrO_3$
- B$Cl_2, KClO_3$
- C$I_2, NaIO_3$
- D$Cl_2, NaClO_3$
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