Aqueous solution of a salt (Y) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H2SO4 is added to a hot concentrated solution of (Y), white crystals of a weak acid separate out. Hence, the compound (Y) is

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Na2SO4⋅10H2O

Ca2P6O11⋅10H2O

Na2B6O11

Na2B4O7⋅10H2O

answer is D.

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Detailed Solution

Na2B4O7+H2SO4+SH2O⟶Na2SO4+4H3O3 (White crystals)

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