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

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Canvas Classes · Accepted Answer

In the borax bead test:

Step 1: Borax melts and loses water to form sodium metaborate and :

Step 2: In the oxidising flame, the metal salt reacts with :

(copper metaborate) gives the characteristic blue-green colour in the oxidising flame.

In the reducing flame, Cu is reduced to Cu metal (red/opaque bead).

Answer: Option (3) —

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