1.

Ca_(2)B_(6)O_(11)+Na_(2)CO_(3) overset(Delta)rarr[X]+CaCO_(3)+NaBO_(2) ( unbalanced equation) correct choice for [X] is :

Answer»

Structure of ANION of crystalline [X] has one BORON atom `sp^(3)` hybridised and other three boronatoms `sp^(2)` hybridised.
(X) with NaOH (aq.) GIVES a compound which on reaction with `H_(2)O_(2)` in alkaline medium yields a compound used as brightner in soaps
Hydrolysis of (X) with HCl or `H_(2)SO_(4)` yields a compound which on reaction with HF gives fluoroboric acid
[X] on heating with cobalt salt in OXIDISING flame give blue COLOURED bead

Answer :B::C::D


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