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Question

Tincal contains mainly :
$N a_{2} B_{4} O_{7} .10 H_{2} O$
$N a_{2} C O_{3}$
$N a N O_{3}$
$N a_{2} S O_{4}$

A

N a_{2} B_{4} O_{7} .10 H_{2} O

B

N a N O_{3}

C

N a_{2} S O_{4}

D

N a_{2} C O_{3}

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Solution

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The correct option is B $N a_{2} B_{4} O_{7} .10 H_{2} O$
Tincal mainly contains $N a_{2} B_{4} O_{7} \cdot 10 H_{2} O$ . It is borax or sodium tetraborate or sodium borate.

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