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A certain salt X gives the following res...

A certain salt X gives the following results (i) Its aqueous solution shows alkaline to litmus paper (ii) It swells up to a hot glassy material Y on strong heating (iii) When conc. `H_(2)SO_(4)` is added to a solution of X white crystal of an acid Z separates out. Write equation for all the above reactions and identify X,Y and Z.

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(i) `Na_(2)B_(4)O_(7)+ 7H_(2)O rarr 2NaOH+4H_(2)BO_(3)+2H_(2)`
(ii) `underset(("Borax"(x))) (Na_(2) B_(4)O_(7)) overset("heat ") (rarr) 2NaBO_(2)+B_(2)O_(3)`
(iii) `underset((x))(Na_(2)B_(4)O_(7))+underset(("cone"))(H_(2)SO_(4))+5H_(2)O overset("heat ") (rarr) Na_(2)SO_(4)+underset((z))(4H_(3)BO_(3))`
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