Question

The mineral colemanite is finely powdered and boiled with sodium carbonate solution.The precipitate of $CaC{O}_3$ and other two products $X$ and $Y$ are formed.On passing a current of $C{O}_2$, $Y$ produces $X$. What is the molecular formula of colemanite?

• A. $C{a}_2{B}_6{O}_{11}$
• B. $Ca{B}_6{O}_{10}$
• C. $C{a}_3{B}_6{O}_{13}$
• D. $C{a}_2{B}_8{O}_{11}$

Answer 1

Answer: (A)

$C{a}_2{B}_6{O}_{11}$

Colemanite ($C{a}_2{B}_6{O}_{1}1$) is a borate mineral found in evaporite deposits of alkaline Hence option A is correct.