What happens when (only give reaction) (i) Aluminium dissolves in dil

1.	What happens when (only give reaction) (i) Aluminium dissolves in dilute HCl. (ii) Borax dissolves in water. (iii) Acidifying an aqueous solution of borax. (iv) Treating boron trifluoride with LiAlH4 in diethyl ether. (v) Ammonia reacts with diborane.
Answer» (i) 2Al(s) + 6HCl(aq) → 2Al³⁺(aq) + 6Cl⁻(aq) + 3H₂(g) (ii) Na₂B₄O₇ + 7H₂O → 2NaOH + 4H₃BO₃ (iii) Na₂B₄O₇ + 2HCl + 5H₂O → 2NaCl + 4B(OH)₃ (iv) 4BF₃ + 3LiAlH₄ → 2B₂H₆ + 3LiF + 3AlF₃ (v) 3B₂H₆+ 6NH₃ → 3[BH₂(NH₃)₂] +[BH₄]⁻ \(\overset{\Delta}{\rightarrow}\) 2B₃N₃H₆ + 12H₂

What happens when (only give reaction) (i) Aluminium dissolves in dilute HCl. (ii) Borax dissolves in water. (iii) Acidifying an aqueous solution of borax. (iv) Treating boron trifluoride with LiAlH4 in diethyl ether. (v) Ammonia reacts with diborane.

Answer»

(i) 2Al(s) + 6HCl(aq) → 2Al³⁺(aq) + 6Cl⁻(aq) + 3H₂(g)

(ii) Na₂B₄O₇ + 7H₂O → 2NaOH + 4H₃BO₃

(iii) Na₂B₄O₇ + 2HCl + 5H₂O → 2NaCl + 4B(OH)₃

(iv) 4BF₃ + 3LiAlH₄ → 2B₂H₆ + 3LiF + 3AlF₃

(v) 3B₂H₆+ 6NH₃ → 3[BH₂(NH₃)₂] +[BH₄]⁻ \(\overset{\Delta}{\rightarrow}\) 2B₃N₃H₆ + 12H₂