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Q.

During the borax bead test with CuSO4, a blue green colour of the bead was observed in Oxidizing flame due to the formation of

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a

Cu(BO2)2

b

CuO

c

Cu3B2

d

Cu

answer is D.

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Detailed Solution

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The blue-green color observed in the borax bead test with CuSO₄ in an oxidizing flame is due to the formation of Cu(BO₂)₂.

Explanation:

During the test, borax reacts with copper ions (Cu²⁺) to form copper metaborate (Cu(BO₂)₂) in the oxidizing flame, which gives the characteristic blue-green color. This happens as the oxidizing flame provides sufficient oxygen to form the metaborate.

Correct Answer: Cu(BO₂)₂.

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