A certain salt X, givesthe followingresults.(i) Its aqueous solution isalkaline tolitmus. (ii) It swell up to a glassy materialY onstrongheating. (iii) When conc. H_(2)SO_(4)is added to a hot solution of X,white crystal of anacid Z separate out Writeequations for all the above reaction and identify X,Y and Z.

A certain salt X, givesthe followingresults.(i) Its aqueous solution i

1.	A certain salt X, givesthe followingresults.(i) Its aqueous solution isalkaline tolitmus. (ii) It swell up to a glassy materialY onstrongheating. (iii) When conc. H_(2)SO_(4)is added to a hot solution of X,white crystal of anacid Z separate out Writeequations for all the above reaction and identify X,Y and Z.
Answer» Solution :(i) Since the aqueoussolution of salt (X) is alkaline to litmus, it must be the saltof a strong base and a weak acid. (ii) Since the salt (X) swellsup to a glassy material (Y) on strong heating,therefore (X) must be borax and (Y)must be a MIXTUREOF sodium metaborate and boric anhydride. (III)When CONC. `H_(2)SO_(4)`is added to a hot solution of X, i.e, borax,white crystalsof an acid (Z)separateout, therefore(Z)must beorthobasicacid. The equations for thereactionsinvolvedin the question are : (i) `underset("Borax (X)")(Na_(2)B_(4)O_(7). 10 H_(2)O) overset("Water")rarr underset(("Strong alkali"))(2NaOH)+ underset(("Weask acid"))(H_(2)B_(4)O_(7) + 8H_(2)O` (ii) `underset((X))(Na_(2)B_(4)O_(7).10H_(2)O)overset("Heat")rarrNa_(2)B_(4)O_(7)+10H_(2)O, Na_(2)B_(4)O_(7) overset("Heat")rarrubrace(2NaBO_(2) + B_(2)O_(3))_("Glassy material")` (iii) `Na_(2)B_(4)O_(7).10H_(2)O+H_(2)SO_(4)rarrunderset(" Boric acid (Z) ")(4H_(3)BO_(3))+Na_(2)SO_(4)+5H_(2)O`