Ca_(2)B_(6)O_(11) + Na_(2)CO_(3) overset("fusion")rarr A + B + CaCO_(3) A("solution") + CO_(2)rarr B + Na_(2)CO_(3) B + Conc HCl rarr NaCl + C ("acid") The correct statement(s) among the following is/are :

Ca_(2)B_(6)O_(11) + Na_(2)CO_(3) overset("fusion")rarr A + B + CaCO_(3

1.	Ca_(2)B_(6)O_(11) + Na_(2)CO_(3) overset("fusion")rarr A + B + CaCO_(3) A("solution") + CO_(2)rarr B + Na_(2)CO_(3) B + Conc HCl rarr NaCl + C ("acid") The correct statement(s) among the following is/are :
Answer» Compound A is `NaBO_(2)` `1` mole of solution of B REQUIRES 2 moles of HCL for its complete reaction Compound C is `H_(2)B_(4)O_(7)`, pH of aq solution of B is EQUAL to pKa of acid C when equimolar SOLUTIONS of B and C are considered. Answer :A::B::C