First slide

13th group or boron group

Question

$N a_{2} B_{4} O_{7} . 10 H_{2} O$ Borax can also represented as ____?

Moderate

A

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

$2 N a_{2} B O_{2} . N a_{2} B_{2} O_{3} . 10 H_{2} O$
C

$2 N a_{2} [B_{4} {(H_{2} O)}_{4} O_{7}] . 6 H_{2} O$
D

All the above

Solution

Follow the following manipulation.
$\begin{array}{l} N a_{2} B_{4} O_{7} . 10 H_{2} O = N a_{2} [B_{4} O_{7} . 2 H_{2} O] 8 H_{2} O \\ = N a_{2} [B_{4} O_{5} {(O H)}_{4}] 8 H_{2} O \end{array}$

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