Due to the presence of transition metal ions i.e. Chromium(VI) ions
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Barium emits green light when it is heated and energized, giving it a distinctive green color.
Aqueous barium nitrate is colorless.
Barium chloride typically appears as a white crystalline solid.
Barium chloride is white in its solid form. When heated, it remains white because its color does not change.
Barium compounds are commonly used in fireworks to produce a bright green color. Barium nitrate and barium chlorate are two examples of barium compounds that are utilized to achieve the desired green color in fireworks.