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`Ca_2B_6O_11+Na_2CO_3oversetDeltato[X]+CaCO_3+NaBO_2`(unbalanced equation) Correct choice for [X] is/are:A. structure of anion of crystalline [X] has one boron atom `sp^3` hybridised and other three boron atoms `sp^2` hybridised.B. X with NaOH(aq.) gives a compound which on reaction with hydrogen peroxide in alkaline medium yields a compound used as brightner in soaps.C. hydrolysis of [X] with HCl or `H_2SO_4` yields a compound which on reaction with HF gives fluoroboric acidD. [X] on heating with chromium salts in oxidising flame gives green coloured bead in cold. |
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Answer» Correct Answer - B,C,D Compound [X] is `Na_2B_4O_7` (A)two boron atoms are `sp^2` while other two boron atoms are `sp^3` hybridised (B) product is sodium peroxoborate which is used as brightner in soaps. (C ) `H_3BO_3` is formed which HF gives `HBF_4` (D)Green bead in oxidising as well as in reducing flame in cold. |
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