1.

Ca_2B_6O_11+Na_2CO_3oversetDeltato[X]+CaCO_3+NaBO_2(unbalanced equation) Correct choice for [X] is/are:

Answer»

structure of anion of crystalline [X] has one boron atom `sp^3` hybridised and other THREE boron atoms `sp^2` hybridised.
X with NaOH(aq.) gives a compound which on reaction with hydrogen peroxide in alkaline medium yields a compound used as brightner in soaps.
hydrolysis of [X] with HCL or `H_2SO_4` yields a compound which on reaction with HF gives fluoroboric acid
[X] on HEATING with chromium salts in oxidising flame gives green coloured bead in cold.

Solution :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.


Discussion

No Comment Found

Related InterviewSolutions