Which of the following ions cannot be detected by the borax bead or microcosmic bead test?

C u^{2 +}

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C r^{3 +}

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F e^{3 +}

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Z n^{2 +}

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Solution

The correct option is C $Z n^{2 +}$
Borax bead or microcosmic bead test is performed by coloured cations only and as $Z n^{2 +}$ is colourless due to the absence of unpaired electron, so it cannot be detected by the borax bead or microcosmic bead test.

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Similar questions

C u^{2 +}

N a_{2} B_{4} O_{7} Δ \to 2 N a B O_{2} + B_{2} O_{3}

B_{2} O_{3} + C u O \to C u (B O_{2})_{2}

C u (B O_{2})_{2}

C u^{2 +}

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