Borax-bead test can be used to identify following ions :

{C a}^{2 +}

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{C r}^{3 +}

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{M n}^{2 +}

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{C u}^{2 +}

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Solution

The correct options are
B ${C r}^{3 +}$
C ${M n}^{2 +}$
D ${C u}^{2 +}$
Borax-bead test can be used to identify coloured ions such as ${C r}^{3 +}, {M n}^{2 +}, {C u}^{2 +}$ .
A transparent bead of borax is first prepared when borax is heated on to a platinum wire loop and then the salt that is required to be analysed will be placed on the bead.
$N a_{2} B_{4} O_{7} .10 H_{2} 0 + H e a t \to 2 N a B O_{2} + B_{2} O_{2} + 10 H_{2} 0$
Borax Transparent bead
Thus, we can identify the radical by the characteristic colour.(Refer table given)

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