Which of the following cation is/are detected by the flame test?....

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Which of the following cation is/are detected by the flame test?
\( \mathrm{P} \)
(1) \( \mathrm{Be}^{2+} \)
(2) \( \mathrm{Mg}^{2+} \)
(3) \( \mathrm{K}^{+} \)
(4) \( \mathrm{Ba}^{2+} \)


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