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Preparation of Haloalkanes from Alcohol

Borax is prep...

Question

Borax is prepared by treating colemanite with :

N a N O_{3}

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NaCl

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N a H C O_{3}

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N a_{2} C O_{3}

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Solution

The correct option is D $N a_{2} C O_{3}$
Option (D) is correct.
Borax is prepared by treating colemanite with $N a_{2} C O_{3}$ .
$C a_{2} B_{6} O_{11} C o l e m a n i t e + 2 N a_{2} C O_{3} ⟶ N a_{2} B_{4} O_{7} b o r a x + 2 N a B O_{2} Sodium metaborate + 2 C a C O_{3} ↓$
Sodium metaborate is also converted to borax by passing carbon dioxide through it.
$4 N a B O_{2} + C O_{2} ⟶ N a_{2} B_{4} O_{7} + N a_{2} C O_{3}$

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