Due to the presence of transition metal ions i.e. Chromium(VI) ions
The color of barium in flame is pale green.
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.
It's name is "barium dichromate". Some people also use the antiquated (and wrong) term "bichromate", which should no longer be used. (See also the provided link.)
I think the reaction equation can be written as follows: K2Cr2O7 (aq) + BaCl2(aq) ------ BaCr2O7(s) + 2KCl(aq).
K2Cr2O7 is potassium dichromate, a commonly used oxidizing agent in chemical laboratories. It is orange in color and is soluble in water.
The color of barium in flame is pale green.
The flame of barium nitrate typically produces a pale green color when burned. This green color is a characteristic flame test color for barium compounds.
Aqueous barium nitrate is colorless.
blue
Barium chloride typically appears as a white crystalline solid.
The orange color of potassium dichromate is caused by the movement of an electron to a vacant d-orbital in the manganese atom. The transition occurs when the chemical is in the presence of light. This is confirmed by the empty 3d-orbital in chromium.
The compound BaSO4 is known as barium sulfate. Because of its white color, it is sometimes used for pigmentation, especially in paper.
The flame color of barium burning in oxygen is green.
Barium chloride is white in its solid form. When heated, it remains white because its color does not change.