p-Block Elements-I - Result Question 55

####26. (i) How is boron obtained from borax? Give chemical equations with reaction conditions.

(ii) Write the structure of B2H6 and its reaction with HCl.

(2002)

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Solution:

  1. (i) Na2B4O7+HClNaCl+H3BO3

H3BO3+HClΔBCl3+H2O BCl3+AlΔB+AlCl3

(ii) B2H6 :

It has 4 terminal BH bonds. There are two BHB, three centred two electron bridged bonds.

B2H6+HClB2H5Cl+H2



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