The blue colour in an oxidising flame of a microcosmic bead containing $C u^{2 +}$ is due to:

N a C u P O_{4}

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C u (P O)_{4}

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C u_{3} (P O_{4})_{2}

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None of the above

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Solution

The correct option is A $N a C u P O_{4}$
Microcosmic salt bead test is a test similar to borax bead test and is used for the identification of coloured cations if microcosmic salt, $N a (N H_{4}) H P O_{4} .4 H_{2} O$ is used.
The involved reactions are given below:
$N a (N H_{4}) H P O_{4} .4 H_{2} O Δ - \to N a P O_{3} + H_{2} O (g) + N H_{3} (g)$
Transparent bead
$N a P O_{3} + C u O \to N a C u P O_{4}$
Blue bead

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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 o}^{2 +}

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