Which of the following cations will turn a borax bead blue in oxidising flame?

F e^{3 +}

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F e^{2 +}

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C o^{2 +}

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C u^{2 +}

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Solution

The correct options are
C $C o^{2 +}$
D $C u^{2 +}$

${C o}^{2 +}, {C u}^{2 +} give blue color in oxidising as well$ $as reducing flame .$

$C o O + {N a B O}_{2} \to {N a C o B O}_{3}, C u O + {N a B O}_{2} \to {N a C u B O}_{3}$

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