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Borax

The mineral c...

Question

The mineral colemanite is finely powdered and boiled with which solution to get the borax.

Sodium carbonate solution

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Sodium bicarbonate solution

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Sodium oxide solution

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Sodium peroxide solution

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Solution

The correct option is A Sodium carbonate solution
The mineral colemanite is finely powdered and boiled with sodium carbonate solution.
$C a_{2} B_{6} O_{11} + 2 N a_{2} C O_{3} (i) F u s e - --- \to (i i) H_{2} O 2 C a C O_{3} ↓ + N a_{2} B_{4} O_{7} + 2 N a B O_{2}$
On passing current of $C O_{2}$
$4 N a B O_{2} + C O_{2} \to N a_{2} B_{4} O_{7} + N a_{2} C O_{3} ↓$
$N a_{2} B_{4} O_{7}$ is used in borax bead test.

THEORY
Preparation:
1. When colemanite powder is heated with $N a_{2} C O_{3}$ solution, $C a C O_{3}$ is precipitated.
$C a_{2} B_{6} O_{11} + 2 N a_{2} C O_{3} \to 2 C a C O_{3} ↓ + N a_{2} B_{4} O_{7} + 2 N a B O_{2}$
$4 N a B O_{2} + C O_{2} \to N a_{2} B_{4} O_{7} + N a_{2} C O_{3} precipitates out on crystallization$
2. By the action of $N a_{2} C O_{3}$ on $H_{3} B O_{3}$
$4 H_{3} B O_{3} + N a_{2} C O_{3} \to N a_{2} B_{4} O_{7} + 6 H_{2} O + C O_{2} ↑$

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