Q33 of 44 Page 324

An aqueous solution of borax is

Borax is a salt of a strong base(NaOH) and a weak acid (H3BO3). It is therefore basic in nature.

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31

Write balanced equations for:

(i) BF3 + LiH →


(ii) B2H6 + H2O →


(iii) NaH + B2H6→


(iv)


(v) Al + NaOH →


(vi) B2H6 + NH3→

 32

Give one method for industrial preparation and one for laboratory preparation of CO and CO2 each.

 34

Boric acid is polymeric due to

 35

The type of hybridisation of boron in diborane is