Borax is written as:

N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O

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N a_{2} [B_{4} (O H)_{7} O_{2}] .3 H_{2} O

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N a_{2} O B_{4} O_{8} H_{2}

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N a_{2} B_{4} O_{1} 7 H_{2} O

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Solution

The correct option is A $N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O$
The IUPAC name of borax is sodium tetraborate decahydrate. The molecular formula is $N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O$

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N a_{2} [B_{4} O_{5} (O H)_{4}] .8 H_{2} O

N a_{2} [B_{4} O_{5} (O H)_{4}] \cdot 8 H_{2}

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