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JEE Main 2024 (Online) 30th January Evening Shift
Numerical
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Number of metal ions characterized by flame test among the following is ________.
$$\mathrm{Sr}^{2+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Co}^{2+}, \mathrm{Fe}^{2+}$$
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