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# Refer to the below equation :

From above equation the white acquous mass is

$\begin{array}{1 1}(a)\;Na_2B_4O_7&(b)\;Na_3B_2O_7\\(c)\;NaB_4O_7&Na_3B_2O_7\end{array}$

$Na_2B_4O_7$
Hence (a) is the correct answer.