Question

Question 11.31 Write balanced equations for:

(i) BF3 + LiH→

(ii) B2H6 + H2O→

(iii) NaH + B2H6→

(iv) H3BO3 --->

(v) Al + NaOH→

(vi) B2H6 + NH3→

Class XI The p-Block Elements Page 325

Answer 1

hope it will help you

Answer 2

(i) BF₃ + 6LiH --------> B₂H₆(diborane) + 6LiF
(ii) B₂H₆ + H₂O -------> 2H₃BO₃(orthoboric acid) + 6H₂
(iii) 2NaH + B₂H₆ -----> 2Na⁺[BH₄]⁻ (sodium borohydride )
$(iv) H_3BO_3----(\triangle,370K)--->HBO_2+H_2O\\4HBO_2(Metaboric \:acid)----(\triangle,-H_2O)--->H_2B_4O_7(tetraboric \:acid)----\triangle--->2B_2O_3(boron\: oxide) + H_2O$

(v) 2Al + 2NaOH + 6H₂O ------> 2Na⁺[Al(OH)₄]⁻ + 3H₂

(vi) (a) B₂H₆ + 2NH₃ ------> 2BH₃.NH₃ or, [BH₂(NH₃)₂]⁺[BH₄]⁻

(b) 3B₂H₆ + 6NH₃ --------> 3[BH₂(NH₃)₂]⁺[BH₄]⁻ ----Δ---> 2B₃N₃H₆( borazine) + 12H₂