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Q.

The compound formed in the borax bead test of ${Cu}^{2 +}$ ion in oxidising flame is:

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a

${CuBO}_{2}$

b

$Cu$

c

$Cu ({BO}_{2})_{2}$

d

${Cu}_{2} ({BO}_{2})$

answer is C.

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Detailed Solution

The compound formed in the borax-bead test of Cu²⁺ ion in oxidizing flame is Cu(BO₂)₂. It gives green colour in hot oxidizing flame and blue colour in cold oxidizing flame.

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