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

Question

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 +

TestHub · Accepted Answer

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.
${Sr}^{2 +} - Crimson red colour {Cu}^{2 +} - Blue green colour {Ca}^{2 +} - Brick red colour {Ba}^{2 +} - Pale green colour$
Hence, the answer is $4$ .

Chemistry - Salt Analysis Question with Solution | TestHub

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