The correct formula of borax is:

N a_{2} [B_{4} O_{4} (O H)_{3}] \cdot 9 H_{2} O

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

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N a_{2} [B_{4} O_{6} (O H)_{5}] \cdot 7 H_{2} O

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N a_{2} [B_{4} O_{7} (O H)_{6}] \cdot 6 H_{2} O

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N a_{2} [B_{4} O_{8} (O H)_{7}] \cdot 5 H_{2} O

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Solution

The correct option is A $N a_{2} [B_{4} O_{5} (O H)_{4}] \cdot 8 H_{2} O$
Borax, also called sodium tetraborate, is a powdery white mineral that has been used as a cleaning product for several decades.

Formula of borax is $N a_{2} [B_{4} O_{5} (O H)_{4}] \cdot 8 H_{2} O$ .

Hence, option $B$ is correct.

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