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Smelting

A minute quan...

Question

A minute quantity of cupric salt is heated on borax bead in reducing flame of Bunsen burner; the color of bead after cooling will be :

A

Blue

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B

Red

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C

Colorless

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D

Green

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Solution

The correct option is B Red
The color of bead after cooling will be red.

Copper salts gives red color in reducing flame and green color in oxidising flame.
$2 C u (B O_{2})_{2} + 4 N a B O_{2} ⟶ 2 C u + 2 N a_{2} B_{4} O_{7} + 2 C O ↑$

Option (B) is correct.

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