When borax is dissolved in water:

B (O H)_{3}

is formed only

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[B (O H)_{4}]^{-}

formed only

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Both

B (O H)_{3}

and

[B (O H)_{4}]^{-}

are formed

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[B_{3} O_{3} (O H)_{3}]^{-}

is formed only

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Solution

The correct option is A $B (O H)_{3}$ is formed only
Borax is a white crystalline solid of formula $N a_{2} B_{4} O_{7} \cdot 10 H_{2} O .$
Borax dissolves in water to give an alkaline solution.
$N a_{2} B_{4} O_{7} + 7 H_{2} O \to 2 N a O H + 4 H_{3} B O_{3}$
Thus $B (O H)_{3}$ is formed only.
Hence correct option is a.

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1 mol

2 mol

B (O H)_{3} + H_{2} O \to [B (O H)_{4}]^{-} + H^{+}

B (O H)_{3} + 2 H_{2} O ⇌ [B (O H)_{4}]^{-} + H_{3} O^{+}

B (O H)_{3} + N a O H \to N a B O_{2} +

N a

[B (O H)_{4}] + H_{2} O

B (O H)_{3} + N a O H \to N a [B (O H)_{4}]

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