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What is the chemical formula of the mineral colemanite?

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in Chemistry – Class 11 by (148k points)
What is the chemical formula of the mineral colemanite?

(a) CaB6O.5H2O

(b) Na2B4O7.10H2O

(c) Ca2B6O.5H2O

(d) Na4O7.10H2O

The question was asked in exam.

This intriguing question originated from p-Block Elements in portion p-Block Elements of Chemistry – Class 11

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Correct choice is (c) Ca2B6O.5H2O

The explanation is: The chemical formula of the colemanite is Ca2B6O.5H2O. 5H2O and it is given that borax occurs naturally as tincal in dried up lakes it is also obtained by boiling of mineral colemanite with a solution of sodium carbonate.

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