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Q. Borax is prepared by treating colemanite with

The p-Block Elements

Solution:

$Ca _{2} B _{6} O _{11}+2 Na _{2} CO _{3} \rightarrow 2 CaCO _{3} \downarrow+ Na _{2} B _{4} O _{7}$ $+2 NaBO _{2}$