The nature of aqueous solution of borax is:

Acidic

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Neutral

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Amphoteric

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Basic

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Solution

The correct option is D Basic
When borax is dissolved in water it ionizes and hydrolysis of borate ion gives the hydroxyl ion and boric acid. Since boric acid is a weak acid and $N a O H$ is strong alkali an aqueous solution of borax is alkaline in nature.
$N a_{2} B_{4} O_{7} + 7 H_{2} O \to 2 N a O H + 4 H_{3} B O_{3}$

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