1.

Ageous solution of a sqalt (Y) is alkline tolitmas On strong heating it swells-up to give a glassy material .Whencone H_(2)SO_(4) in added to a hotconcentrated solution of (Y) whitecrystalsof a weak acid sepurate out .Hence , the compound (Y) is

Answer»

`Na_(2)SO_(4).10H_(2)O`
`Ca_(2)P_(4)O_(11).10H_(2)O`
`Na_(2)B_(6)O_(11)`
`Na_(2)B_(4)O_(7).10H_(2)O`

Solution :`Na_(2)B_(4)O_(7)+7H_(2)Orarr ubrace(underset("Stronge base")(2NaOH)+underset("Weak acid")(4H_(3)BO_(3)))_("Alkaline")`
`Na_(2)B_(4)O_(7)+7H_(2)O overset(Delta)rarrubrace(2NaBO_(2)+B_(2)O_(3))_("Glassy-bead")`
`underset(("WHITE crystals"))(Na_(2)B_(4)O_(7))+H_(2)SO_(4)+5H_(2)O RARR Na_(2) SO_(4) +4H_(3)BO_(3)`


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