A) \[Ca[{{B}_{3}}{{O}_{4}}{{(OH)}_{2}}.2{{H}_{2}}O\]
B) \[C{{a}_{2}}{{B}_{6}}{{O}_{11}}.5{{H}_{2}}O\]
C) \[Ca{{(OH)}_{2}}\]
D) \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.2{{H}_{2}}O\]
Correct Answer: B
Solution :
Colemanite is an ore of boron \[\text{(C}{{\text{a}}_{\text{2}}}{{\text{ }\!\![\!\!\text{ }{{\text{B}}_{\text{3}}}{{\text{O}}_{\text{4}}}\text{(OH) }\!\!]\!\!\text{ }}_{\text{3}}}\text{)}\text{.2}{{\text{H}}_{\text{2}}}\text{O}\]or \[(C{{a}_{3}}{{B}_{6}}{{O}_{11}}.5{{H}_{2}}O)\] commercially boron is extracted from borax and colemanite \[Borax=N{{a}_{2}}{{B}_{4}}{{O}_{7}}.10{{H}_{2}}O\] \[Kernite=N{{a}_{2}}{{B}_{4}}{{O}_{7}}.2{{H}_{2}}O\] while \[\text{Ca(OH}{{\text{)}}_{\text{2}}}\]is slaked lime.
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