A) \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.10{{H}_{2}}O\]
B) \[C{{a}_{2}}{{B}_{6}}{{O}_{11}}.5{{H}_{2}}O\]
C) \[NaB{{O}_{2}}\]
D) \[{{H}_{3}}B{{O}_{3}}\]
Correct Answer: B
Solution :
Colemanite, an ore of boron is \[\text{C}{{\text{a}}_{\text{2}}}{{\text{B}}_{\text{6}}}{{\text{O}}_{\text{11}}}\text{.5}{{\text{H}}_{\text{2}}}\text{O}\text{.}\]
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