Number of metal ions characterized by flame test among the following is _________.
${Sr}^{2 +}, {Ba}^{2 +}, {Ca}^{2 +}, {Cu}^{2 +}, {Zn}^{2 +}, {Co}^{2 +}, {Fe}^{2 +}$

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Number of metal ions characterized by flame test among the following is _________. Sr ^ 2 + , Ba ^ 2 + , Ca ^ 2 + , Cu ^ 2 + , Zn ^ 2 + , Co ^ 2 + , Fe ^ 2 +

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The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic colour the salt turns the flame of a Bunsen burner. The heat of the flame excites the electrons of the metal ions, causing them to emit visible light.
${Sr}^{2 +} - Crimsonredcolour{Cu}^{2 +} - Bluegreencolour{Ca}^{2 +} - Brickredcolour{Ba}^{2 +} - Palegreencolour$
Hence, the answer is $4$ .

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