1.

Aqueous solution of a salt (V) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H_(2)SO_(4) is added to a hot concentrated solution of (V), white crystals of a weak acid separates out. Hence, the compound (Y) is

Answer»

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

Solution :`(Y) is borax `Na_(2)B_(4)O_(7).10H_(2)O`
`Na_(2)B_(4)O_(7)+7H_(2)Otounderset(ubrace("Strong base WEAK acid")_("Alkaline"))(2NaOH+4H_(2)BO_(3))`
`Na_(2)B_(4)O_(7)overset(Delta)toubrace(2NaBO_(2)+B_(2)O_(3))_("Glassy-bead")`
`Na_(2)B_(4)O_(7)+H_(2)SO_(4)+5H_(2)OtoNa_(2)SO_(4)+4H_(2)BO_(3)`
Hence,(D) is the correct answer.


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