What happens when a. Borax is heated strongly. b. Boric acid is added to water. c. Aluminium is treated with dil NaOH. d. BF_(3) is reacted with ammonia.

What happens when a. Borax is heated strongly. b. Boric acid is adde

1.	What happens when a. Borax is heated strongly. b. Boric acid is added to water. c. Aluminium is treated with dil NaOH. d. BF_(3) is reacted with ammonia.
Answer» Solution :a.When borax is strongly heated, a transparent glassy bead which CONSISTS of sodium metaborate and boric anhydride is formed. `underset("Borax")(Na_(2)B_(4)O_(7).10H_(2)O)OVERSET(Delta)toNa_(2)B_(4)O_(7)+10H_(2)O` `Na_(2)B_(4)O_(7)underset("RED Heat")overset(Delta)tounderset(ubrace({:(" Sodium,Boric"),("metaborate,anhydride"):})_("Transport glassy bead"))(2NaBO_(2)" + "B_(2)O_(3))` b. Boric acid behaves as a Lewis acid and hence accepts `overset(ө)OH` ion form `H_(2)O` and realeses `H^o+` in the solution. c. `2Al_((s))+underset(("dil"))(NaOH_((aq)))+6H_(2)Oto2Na^(o+)[Al(OH)_(4)]_((aq))^()+3H_(2(g)) or underset("Sodium meta-aluminate(III)")(Na_(2)AlO_(2).2H_(2)O)` d.`F_(3)B+:NH_(3)to[F_(3)Blarr:NH_(3)]` `BF_(3)` is a Lewis acid and accepts a pair of electron from `N` of `NH_(3)` molecule to form an adduct, `[F_(3)Blarr:NH_(3)]`